TweetFollow Us on Twitter

Nov 01 Challenge

Volume Number: 17 (2001)
Issue Number: 11
Column Tag: Programmer's Challenge

by Bob Boonstra, Westford, MA

Seega

While rummaging through a dresser drawer, I ran across a collection of magnetic board games put out by a company called Midnite Snack, www.magneticgames.com. The company advertises them as ancient games from all over the world. I don't know how popular these games are across the world, but some of them looked like they might make interesting Challenge problems. This month, your Challenge is to write code that plays the game Seega.

The prototype for the code you should write is:

typedef struct Position {
   int row;      /* 0..boardSize-1 */
   int col;    /* 0..boardSize-1 */
} Position;

typedef struct Board {
   int boardSize;      
      /* odd integer >= 5 */
   char cell[];      
      /* board Position (row,col) is cell[ row*boardSize + col ] */
      /* cell[]==0 is an empty cell */
} Board;

void InitGame(
   int boardSize;      
      /* number of rows and columns, odd integer >= 5 */
   char pieceValue;   
      /* value assigned to your pieces, 1..numberOfPlayers */
   Boolean playFirst;   
      /* TRUE if you place pieces first (and move second) */
   int stalemateThreshold;   
      /* stalemate will be declared after this number of moves without a capture */
);

void PlacePieces(
   const Board board;   
      /* board state before you place pieces */
   Position *placePiece1;   
      /* place a piece at *placePiece1 */
   Position *placePiece2;   
      /* place a piece at *placePiece2 */
)

void MovePiece(
   const Board board;   
      /* board state before you move a piece, updated by test code */
   Boolean followUpMove;   
      /* TRUE if you must make another capture with the last piece moved */
   Position *moveFrom;   
      /* location you are moving from, (-1,-1) if you cannot move */
   Position *moveTo;   
      /* location you are moving to, (-1,-1) if you cannot move */
   Boolean *blocked;   
      /* return TRUE if you cannot move */
);

void TermGame(void);

Seega is played on a 5x5 board, which we will be generalizing to an nxn board, for odd values of n no smaller than 5. Each player has 12 pieces, or in the general case, (nxn-1)/2 pieces. The game is played in two phases. In the first phase, players take turns placing two pieces anywhere on the board except for the center square. After both players have placed all of their pieces on the board, the player who last placed a piece moves one piece horizontally or vertically (not diagonally). An opponent's pieces are captured when they are between, horizontally or vertically, the piece moved by the player and another of the player's pieces. More than one piece can be captured on a single move. When a player captures one or more of his/her opponent's pieces, the capturing player makes another move if another capture can be made with the same piece. No piece in the center of the board may be captured. A piece that is moved between two opponent pieces is not captured. If a player cannot move, it becomes the opponent's turn to move again. The player who captures all of his opponent's pieces wins the game. In the event both players retain pieces, and no more captures can be made, the player with the most pieces on the board wins the game.

Your InitGame routine will be called with the game parameters, the size of the board (boardSize), the value assigned to your pieces (pieceValue), whether you will be the first person to place pieces on the board (playFirst), and the number of moves without a capture before a stalemate is declared (stalemateThreshold).

When it is your turn to place pieces on the board during the first phase of the game, your PlacePieces routine will be called. You will be given the current state of the board, and should return the locations of the next two pieces you place on the board.

Your MovePiece routine will be called when it is your turn to move. Again, you will be given the current state of the board. You should return the location of the piece that you chose to move, and the location you move it to. The test code will remove any pieces captured by your opponent, and call MovePiece again if another capture can be made by the piece you moved. If your code is called to make another move with the same piece, the flag followUpMove will be TRUE.

When a game is over, your TermGame routine will be called. You should return any dynamically allocated memory and perform any other necessary cleanup.

Any illegal move will result in loss of the game. Illegal moves include attempting to move a piece from a cell where you do not have a piece, or attempting to move to an occupied square, or a followUpMove with a different piece than moved previously.

Entries will be evaluated by conducting a round-robin or other fair tournament. Each entry will be given the same number of opportunities to play first against each of its opponents. The winner will be the entry that has the best win-loss record. One win (or fraction of a win) will be deducted for each second of cumulative execution time. The Challenge prize will be divided between the overall winner and the best scoring entry from a contestant that has not won the Challenge recently.

Our experiment with new development environments has been less than successful - no entries were submitted using alternative environments for either the September and October Challenges. So this will be a native PowerPC Challenge, using the CodeWarrior Pro 7 environment. Solutions may be coded in C or C++.

Three Months Ago Winner

Congratulations to first time Challenge contestant Tony Cooper (New Zealand) for winning the August Caribbean Cruising Challenge. This problem called for contestants to sail a simulated boat around a sequence of marks, optimizing sail trim and heading to minimize the time required to complete the course. The problem was complicated by the fact that it took me several tries to debug the test code, and I appreciate the patience of the 8 people who persevered and submitted entries.

I evaluated the solutions to this Challenge using twelve scenarios, each consisting of four marks, differing in wind speed, wind direction, and wind variability. The three top-scoring entries were very close in the time required to complete the courses, although they adopted different strategies. The paths taken by the top two solutions for one test case are depicted below. The initial wind direction in the diagrams is coming down from the top of the page, so that the path from the first mark to the second begins directly upwind. Tony Cooper adjusted the boat heading more frequently, attempting to minimize the distance traveled. The second-place entry by Alan Hart, kept the boat further off the wind, traveling a greater distance at a higher speed. The third-place entry by Jonny Taylor took a path similar to Hart's, but stayed even further off the wind.

Tony's entry trims the sail based on a table lookup, which leaves him vulnerable to changes in sailing model. Other entries spent time experimenting with sail trim, making their solutions more interesting in some respects and more realistic. As it turns out, however, Tony's approach was good enough to eek out a Challenge win.


Cooper


Hart

David Whitney submitted two Java entries, one pure Java, and one that used Java Native Interface techniques to integrate with the C test code. Dave's entries used a version of the JDK that isn't supported under Mac OS 9. He and I worked to get his entry running under Mac OS X, but unfortunately I didn't succeed in time for publication. I may write more about using JNI in the Challenge in a later column.

The table below lists, for each of the solutions submitted, the time to complete the simulated sailing courses, the cumulative execution time, the total score (with lower scores being better), and the number of sailing marks successfully navigated. It also lists the code size, data size, and programming language of each entry. As usual, the number in parentheses after the entrant's name is the total number of Challenge points earned in all Challenges prior to this one.

Name Race Time Time(msecs) Score
Tony Cooper 73749 731 74479
Alan Hart (25) 74859 475 75334
Jonny Taylor (56) 75780 1117 76896
Tom Saxton (189) 82292 449 82740
Ernst Munter (778) 207026 1427 208453
David Whitney
K. S. 962334 7465 963628
J. S. 404200 8632 1102509

Name Marks Data Size Code Size Lang
Tony Cooper 48 1408 1100 C
Alan Hart 48 3016 360 C
Jonny Taylor 48 4716 636 C
Tom Saxton 48 948 516 C++
Ernst Munter 48 1336 140 C++
David Whitney Java
K. S. 34 2476 521 C
J. S. 9 9652 664 C

Top Contestants...

Listed here are the Top Contestants for the Programmer's Challenge, including everyone who has accumulated 20 or more points during the past two years. The numbers below include points awarded over the 24 most recent contests, including points earned by this month's entrants.

Rank Name(24 mo) Points(24 mo) Wins TotalPoints
1. Munter, Ernst 273 10 780
2. Saxton, Tom 75 2 193
3. Rieken, Willeke 73 3 134
4. Taylor, Jonathan 63 2 63
5. Wihlborg, Claes 49 2 49
6. Maurer, Sebastian 38 1 108
10. Mallett, Jeff 20 1 114
11. Truskier, Peter 20 1 20
12. Cooper, Tony 20 1 20

...and the Top Contestants Looking for a Recent Win

In order to give some recognition to other participants in the Challenge, we also list the high scores for contestants who have accumulated points without taking first place in a Challenge during the past two years. Listed here are all of those contestants who have accumulated 6 or more points during the past two years.

Rank Name Points(24 mo) TotalPoints
7. Boring, Randy 32 144
8. Shearer, Rob 28 62
9. Sadetsky, Gregory 22 24
13. Schotsman, Jan 14 14
14. Nepsund, Ronald 10 57
15. Hart, Alan 10 35
16. Day, Mark 10 30
17. Downs, Andrew 10 12
18. Desch, Noah 10 10
19. Duga, Brady 10 10
20. Fazekas, Miklos 10 10
21. Flowers, Sue 10 10
22. Nicolle, Ludovic 7 55
23. Hala, Ladislav 7 7
24. Leshner, Will 7 7
25. Miller, Mike 7 7

There are three ways to earn points: (1) scoring in the top 5 of any Challenge, (2) being the first person to find a bug in a published winning solution or, (3) being the first person to suggest a Challenge that I use. The points you can win are:

1st place 20 points
2nd place 10 points
3rd place 7 points
4th place 4 points
5th place 2 points
finding bug 2 points
suggesting Challenge 2 points

Here is Tony's winning Caribbean Cruising solution:

CaribbeanCruising.c
Copyright © 2001
Tony Cooper

#include "CarribeanCruising.h"
#include <stdio.h>
#include <math.h>

/* 
This is probably a dynamic programming problem but those algorithms
chew up CPU time. Real sailors use heuristics. This code does too.
I believe that most of the heuristics in yacht racing are to deal
with wind shifts. Same here.

Unfortunately all these heuristics and optimisation tables are for Bob's
boat. If the real boat is disimilar then we could find ourselves in a
bit of a bathtub.

*/

enum {kStarboardTack = -1, kNoTack = 0, kPortTack = 1};

const double PI = 3.14159265358979;
const double kRadToDeg = (180.0/PI);
const double kDegToRad = (PI/180.0);

// these next consts can be tweaked to optimise the algorithm 

const double kMinTackTime = 15.0;
   // minimum time to maintain current tack (make this too small and you tack too 
   // often, too large and your tacks 
   // go wide of the mark making you vulnerable if the wind shifts
const double tweakFactor = 0.0; 
   // 0.5 is optimal - dunno why. But 0.00 is symmetrical
const Boolean gUseVMC = true;   
   // use VMC when not tacking rather than follow the rhumb line
   // it only helps when wind variability > 7 and it eats CPU time so setting it false may be optimal
const double VMCfraction = 0.10; 
   // fraction of the VMC course change to use (0 to 1) - the more variable the wind 
   // the higher the optimal fraction

// the next section has the optimal settings for Bob's boat
// they are not consts because we may change them if we find ourselves not in Bob's 
// boat
static Direction optimalTackAngle = 64*kDegToRad;

// optimal sailtrim angles for Bob's boat at 10 knots wind and 25 knots wind
static Direction optimalSailAngles10[28] = {
   5,5,5,5,5,5,5,10,15,15,15,20,20,20,25,25,30,30,35,40,45,45,55,
   60,65,75,80,90
};
static Direction optimalSailAngles25[28] = {
   5,5,5,5,5,5,10,15,15,15,20,20,25,25,25,30,30,35,40,40,45,50,55,
   60,70,75,80,90
};

// optimal boat speeds at all points of sail at 10 knots wind and 25 knots wind
static double optimalSpeeds10[28] = {
   1.127832,2.197660,3.230089,4.224883,5.178596,6.086716,6.797097,
   7.115055,7.393258,7.580791,7.722331,7.811481,7.889993,7.905046,
   7.914209,7.875377,7.821882,7.728490,7.627867,7.496973,7.355342,
   7.213593,7.078046,6.952483,6.841550,6.756485,6.704573,6.688348
};
static double optimalSpeeds25[28] = {
   2.735935,5.313390,7.793669,10.17909,12.462901,14.269482,
   15.080794,15.786205,16.311792,16.710061,17.072551,17.343519,
   17.519245,17.671387,17.693380,17.718675,17.626386,17.534003,
   17.352610,17.138842,16.923432,16.679922,16.440601,16.210064,
   16.010814,15.869028,15.763844,15.746795
};

static Position *gMarks;
static short gNumberOfMarks;
static short gCurrentMark;
static double timeOnCurrentTack = 0.0; // time on current tack
static int currentTack;
static double prevTime = 0;

static double NormalizeAngle(double angle) {
   while (angle>PI) angle-=2.0*PI;
   while (angle<=-PI) angle+=2.0*PI;
   return angle;
}

void InitCarribeanCruise(
   short numberOfMarks,
   Position mark[],
      /* must pass through mark[i] for each i in turn */
   double tolerance,
      /* must pass within this distance of each mark */
   double integrationInterval
      /* amount of time between calls to Cruise, in seconds */
) {
#pragma unused (tolerance,integrationInterval)
   gMarks = mark;
   gNumberOfMarks = numberOfMarks;
   gCurrentMark = 0;
}

Boolean /* done */ Cruise(   
   Position boatLocation,    /* boat position at the start of this time segment */
   Velocity boatVelocity,    /* boat velocity at the start of this time segment */
   Velocity windVelocity,    /* true wind velocity at this location and time */
   Direction bowDirection,   /* direction the bow is pointing */
   short marksPickedUp,      /* number of marks picked up thus far */
   double currentTime,       /* time since cruise start, in seconds */
   Direction *targetBowDirection,
      /* commanded boat direction */
   Direction *sailTrim
      /* commanded sail trim, 0..PI/4, measured as angle off the stern,
         in the direction away from the source of the wind.
         Actual sail position is a function of trim and wind direction. */
) {
#pragma unused(boatVelocity,bowDirection)
   double vectorToNextMarkX,vectorToNextMarkY;
   Direction directionOfNextMark;
   Direction trueHeadingOffWind, trueDirectionOffWind;
   Direction optimalBowDirection, optimalSailTrim;
   Direction optimalBowDirection1, optimalBowDirection2;
   Velocity trueBoatVelocity;
   int newTack = kNoTack;
   double VMC, maxVMC;
   Boolean canChangeTack;
   Boolean useVMC;
   int directionIndex, i;

   if (marksPickedUp > gCurrentMark) {
      gCurrentMark = marksPickedUp;
      currentTack = kNoTack;
      timeOnCurrentTack = 0.0;
   }
   
   canChangeTack = (currentTack == kNoTack) || 
            (timeOnCurrentTack >= kMinTackTime);
   useVMC = gUseVMC;
   
   /* find direction toward current mark */
   vectorToNextMarkX = gMarks[gCurrentMark].x - boatLocation.x;
   vectorToNextMarkY = gMarks[gCurrentMark].y - boatLocation.y;
   directionOfNextMark = 
      atan2(vectorToNextMarkX,vectorToNextMarkY); // normalised
   
   windVelocity.direction = 
               NormalizeAngle(windVelocity.direction);
   
   /* find optimal heading */
   trueDirectionOffWind = NormalizeAngle(directionOfNextMark - 
         (PI + windVelocity.direction));
   if (fabs(trueDirectionOffWind) < optimalTackAngle) {
      // we cannot sail into the wind so have to tack
      // when we tack there are two directions we can tack in
      if (!canChangeTack) {
         optimalBowDirection = PI + windVelocity.direction + 
               currentTack*optimalTackAngle; 
// we are not allowed to change tack

         newTack = currentTack;
      } else {
         optimalBowDirection1 = PI + windVelocity.direction + 
                  optimalTackAngle; // port tack
         optimalBowDirection2 = PI + windVelocity.direction - 
                  optimalTackAngle; // starboard tack

         // of the two possible tacks choose the one closest to the direction the mark             
         // is in this keeps you closer to the mark which makes you less vulnerable if
         // the wind changes
   
         if (fabs(NormalizeAngle(optimalBowDirection1 - 
                     directionOfNextMark)) / 
               fabs(NormalizeAngle(optimalBowDirection2 - 
                     directionOfNextMark)) < 1-tweakFactor) {
         //if (fabs(NormalizeAngle(optimalBowDirection1 - directionOfNextMark)) < 
         //   fabs(NormalizeAngle(optimalBowDirection2 - directionOfNextMark))) {
   
            optimalBowDirection = optimalBowDirection1;
            newTack = kPortTack;
         } else {
            optimalBowDirection = optimalBowDirection2;
            newTack = kStarboardTack;
         }
      }
   } else {
      newTack = kNoTack;
      if (useVMC) {
   
      /* calculate the direction of the 28 that gives us the best VMC (velocity made 
            in the direction of the course)
              this may be a better line that the rhumb line because it can leave us closer to the mark 
              if the wind shifts */

         directionIndex = -1;
         maxVMC = 0.0;
         for (i = 0; i < 28; i++) {

            // VMC is the component of the boatspeed in the direction of the mark
            // VMC is the speed times the cos of the angle between the boat direction
            // and the mark

            if (trueDirectionOffWind > 0)
               trueBoatVelocity.direction = NormalizeAngle(PI + 
                     windVelocity.direction + (45 + i *
                     5)*kDegToRad);
            else
               trueBoatVelocity.direction = NormalizeAngle(PI + 
                     windVelocity.direction - (45 + i *
                     5)*kDegToRad);
            if (windVelocity.speed > 17.5)
               trueBoatVelocity.speed = optimalSpeeds25[i];
            else
               trueBoatVelocity.speed = optimalSpeeds10[i];
            VMC = trueBoatVelocity.speed * 
                     cos(trueBoatVelocity.direction -
                     directionOfNextMark);
            // look at VMC for the port tack
            if (VMC > maxVMC) {
               maxVMC = VMC;
               directionIndex = i;
               optimalBowDirection = trueBoatVelocity.direction;
            }
         }
         if (directionIndex != -1) { // positive VMC found
            // we now have two directions to choose: optimalBowDirection and 
            // directionOfNextMark
            // we now compromise between them
         
         /*if (fabs((optimalBowDirection - directionOfNextMark)*kRadToDeg) > 40) {
            FILE *outFile; 
            outFile = fopen("Carribean Cruising-output","a");   
            fprintf(outFile,"%f %f %f %f\n",
            trueDirectionOffWind*kRadToDeg, 
            directionOfNextMark*kRadToDeg, optimalBowDirection*kRadToDeg,
            cos(optimalBowDirection - directionOfNextMark));
                  fclose(outFile);}
         */

            optimalBowDirection = directionOfNextMark + 
               (optimalBowDirection - directionOfNextMark) * 
               VMCfraction;
         } else {
            optimalBowDirection = directionOfNextMark;
         }
      } else {
         optimalBowDirection = directionOfNextMark;
      }
   }
   
   /* find optimal sail trim */

   trueHeadingOffWind = fabs(NormalizeAngle(PI + 
               windVelocity.direction - optimalBowDirection));
   directionIndex = (int)((trueHeadingOffWind*kRadToDeg + 2.5 - 
                                                            45)/5.0); 
      // 2.5 is for rounding to nearest, 2.5, 45, and 5.0 are degrees hence kRadToDeg
   if (directionIndex < 0) directionIndex = 0;
             // not necessary but just in case
   if (directionIndex > 27) directionIndex = 27;
             // not necessary but just in case
   if (windVelocity.speed > 17.5)
      optimalSailTrim = 
         optimalSailAngles25[directionIndex]*kDegToRad;
   else
      optimalSailTrim = 
         optimalSailAngles10[directionIndex]*kDegToRad;

   *targetBowDirection = optimalBowDirection;
   *sailTrim = optimalSailTrim;

   if (currentTack == newTack)
      timeOnCurrentTack += currentTime - prevTime;
   else {
      currentTack = newTack;
      timeOnCurrentTack = 0;
   }
   prevTime = currentTime;

   return false;
}

void TermCarribeanCruise(void) {}

 
AAPL
$103.30
Apple Inc.
+0.80
MSFT
$45.09
Microsoft Corpora
-0.34
GOOG
$577.33
Google Inc.
+5.73

MacTech Search:
Community Search:

Software Updates via MacUpdate

TextSoap 7.4.0 - Flexible text editing u...
TextSoap is for people who work with text. TextSoap effortlessly cleans up text from endlessly different formats. Wash away unwanted characters, spaces, tabs. Fix paragraphs with hard returns at the... Read more
NetShade 6.0.2 - Browse privately using...
NetShade is an Internet security tool that conceals your IP address on the web. NetShade routes your Web connection through either a public anonymous proxy server, or one of NetShade's own dedicated... Read more
Mac DVDRipper Pro 5.0 - Copy, backup, an...
Mac DVDRipper Pro is the DVD backup solution that lets you protect your DVDs from scratches, save your batteries by reading your movies from your hard disk, manage your collection with just a few... Read more
pwSafe 3.1 - Secure password management...
pwSafe provides simple and secure password management across devices and computers. pwSafe uses iCloud to keep your password databases backed-up and synced between Macs and iOS devices. It is... Read more
StatsBar 1.8 - Monitor system processes...
StatsBar gives you a comprehensive and detailed analysis of the following areas of your Mac: CPU usage Memory usage Disk usage Network and bandwidth usage Battery power and health (MacBooks only)... Read more
Path Finder 6.5.5 - Powerful, award-winn...
Path Finder is a file browser that combines the familiar Finder interface with the powerful utilities and innovative features. Just a small selection of the Path Finder 6 feature set: Dual pane... Read more
QuarkXPress 10.2.1 - Desktop publishing...
With QuarkXPress, you can communicate in all the ways you need to -- and always look professional -- in print and digital media, all in a single tool. Features include: Easy to Use -- QuarkXPress is... Read more
Skype 6.19.0.450 - Voice-over-internet p...
Skype allows you to talk to friends, family and co-workers across the Internet without the inconvenience of long distance telephone charges. Using peer-to-peer data transmission technology, Skype... Read more
VueScan 9.4.41 - Scanner software with a...
VueScan is a scanning program that works with most high-quality flatbed and film scanners to produce scans that have excellent color fidelity and color balance. VueScan is easy to use, and has... Read more
Cloud 3.0.0 - File sharing from your men...
Cloud is simple file sharing for the Mac. Drag a file from your Mac to the CloudApp icon in the menubar and we take care of the rest. A link to the file will automatically be copied to your clipboard... Read more

Latest Forum Discussions

See All

Modern Combat 5 Gets a Major Multiplayer...
Modern Combat 5 Gets a Major Multiplayer Update Posted by Jessica Fisher on September 2nd, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Alien Creeps TD Review
Alien Creeps TD Review By Jennifer Allen on September 2nd, 2014 Our Rating: :: EXPENSIVE DEFENSESUniversal App - Designed for iPhone and iPad Alien Creeps TD would be a fun if unremarkable Tower Defense game, but its heavy focus on... | Read more »
The Journey Down: Chapter Two Review
The Journey Down: Chapter Two Review By Jennifer Allen on September 2nd, 2014 Our Rating: :: DARK YET ENTICINGUniversal App - Designed for iPhone and iPad It’s a little dark, in every sense of the word, but The Journey Down:... | Read more »
Function Space, a Social Network App for...
Function Space, a Social Network App for Science, Launches on iOS Posted by Ellis Spice on September 2nd, 2014 [ permalink ] | Read more »
Stupidfast – How Taylor Martinez Switche...
How do you make an Endless Running game more than just another Endless Running game? By adding real life prizes to it, of course! That’s the thinking behind StupidFast: a game designed for football enthusiasts, and the brainchild of former college... | Read more »
Little Raiders: Robin’s Revenge Review
Little Raiders: Robin’s Revenge Review By Jennifer Allen on September 2nd, 2014 Our Rating: :: CASUAL RAIDINGUniversal App - Designed for iPhone and iPad Combining simple combat with village building is a potent combination for... | Read more »
Treasure Tombs: Ra Deal Coming from Bulk...
Treasure Tombs: Ra Deal Coming from Bulkypix and Dark Tonic This Fall Posted by Jessica Fisher on September 2nd, 2014 [ permalink ] Dark Tonic and | Read more »
Pirate Bash Review
Pirate Bash Review By Nadia Oxford on September 2nd, 2014 Our Rating: :: BAD PIRATES, GOOD TIMESUniversal App - Designed for iPhone and iPad Pirate Bash’s turn-based battles add an intriguing twist to a typical physics game.   | Read more »
Tiny Tower Vegas Review
Tiny Tower Vegas Review By Jennifer Allen on September 2nd, 2014 Our Rating: :: STEADY DEVELOPMENTUniversal App - Designed for iPhone and iPad Build a huge tower again but Vegas-style in Tiny Tower Vegas.   | Read more »
The Manhattan Project Review
The Manhattan Project Review By Andrew Fisher on September 2nd, 2014 Our Rating: :: ROCKET SCIENCEUniversal App - Designed for iPhone and iPad The Manhattan Project offers a great Euro-style gameplay experience, but it is totally... | Read more »

Price Scanner via MacPrices.net

Apple refurbished iPads available for up to $...
Apple is offering Certified Refurbished iPad Airs for up to $140 off MSRP. Apple’s one-year warranty is included with each model, and shipping is free. Stock tends to come and go with some of these... Read more
Are We Now In The Post-Post-PC Era?
A longtime and thoroughgoing laptop aficionado, I was more than a little dismayed by Steve Jobs’s declaration back in 2010 when he sprang the iPad on an unsuspecting world. that we’d entered a “post-... Read more
PC Outlook Improves, But 2014 Shipments Still...
According to the International Data Corporation (IDC) Worldwide Quarterly PC Tracker, worldwide PC shipments are expected to fall by -3.7 percent in 2014. To hat’s actually an improvement from the... Read more
IDC Lowers Tablet Sales Projections for 2014...
Following a second consecutive quarter of softer than expected demand, International Data Corporation (IDC) has lowered its worldwide tablet plus 2-in-1 forecast for 2014 to 233.1 million units. The... Read more
Apple now offering refurbished 21-inch 1.4GHz...
The Apple Store is now offering Apple Certified Refurbished 21″ 1.4GHz iMacs for $929 including free shipping plus Apple’s standard one-year warranty. Their price is $170 off the cost of new models,... Read more
Save $50 on the 2.5GHz Mac mini, on sale for...
B&H Photo has the 2.5GHz Mac mini on sale for $549.99 including free shipping. That’s $50 off MSRP, and B&H will also include a free copy of Parallels Desktop software. NY sales tax only. Read more
Save up to $300 on an iMac with Apple refurbi...
The Apple Store has Apple Certified Refurbished iMacs available for up to $300 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free. These are the best prices on... Read more
The Rise of Phablets
Carlisle & Gallagher Consulting Group, a businesses and technology consulting firm focused solely on the financial services industry, has released an infographic depicting the convergence of... Read more
Bad Driver Database App Allows Good Drivers t...
Bad Driver Database 1.4 by Facile Group is a new iOS and Android app that lets users instantly input and see how many times a careless, reckless or just plain stupid driver has been added to the... Read more
Eddy – Cloud Music Player for iPhone/iPad Fre...
Ukraine based CapableBits announces the release of Eddy, its tiny, but smart and powerful cloud music player for iPhone and iPad that allows users to stream or download music directly from cloud... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.