To all the googlers who come through here. The newest version is over at ticalc.org.

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My friends at school told me to make chess. So I did.

I started this on wednesday, so it's pretty new. But it's awesome.



This is me playing against the calculator. I played in 50% speed, so don't think I'm a chess genius. Some strange stuff happens in that game though, like me castling out of check (legal?), it cheating its way out of checkmate, followed by me losing my queen, and then it forks me with a knight.

Since you're wondering, here is how the AI works. It looks through every single possible move and gives it a rating. It then chooses randomly from the top 4 unless there is one clear obvious choice. This way, you don't always play the same game, but the CPU won't pass up an obvious move. This rating is calculated, as of now, by this formula.

4*capture + 3/2*(threatAgainstCpuFinal - threatAgainstCpuInitial) + (threatAgainstPlayerInitial - threatAgainstPlayerFinal)

Each piece is rated on the usual scale. (pawn = 1, bishop = 3, knight = 3, rook = 5, queen = 9, king = 10) To calculate threat, you look at the sum of the reward of all possible attacks. So if there is a lone rook out in the center, and two different pieces can capture it, the threat would be 5 + 5 = 10.

As far as grayscale goes on this one, I'm trying out a new system. The first time you run the program on your calculator, it asks you to calibrate the flicker and adjust the contrast. Then it stores these values internally and never asks you again. But what makes this one different is that when you send it to your friend, it will ask them to recalibrate it even though you have already done so on yours. How? Along with the contrast and delay, it also stores the calcSerial. So if the stored serial and the real serial don't match, it asks to recalibrate.

In it's current state, this game is very playable. The only thing it lacks is pawn promotion, but I even included en passant. The menus however need serious work, the current ones are just to make navigation possible.

And for those people who will ask, GRAPH quits.

Awesome!
Will you be adding pawn promotion sometime soon? If so, then I'm definitely gonna give this to my friends, cuz they all play chess.

Looks really nice!
Are you also gonna add difficulty?

I'm trying. But I doubt I will have different difficulty settings because the hardest one probably won't be too difficult to beat.

Awesome!
Will you be adding pawn promotion sometime soon? If so, then I'm definitely gonna give this to my friends, cuz they all play chess.

Pawn promotion is pretty simple, so that will be in the next update.

This looks incredible!  This is the first Chess with AI that I've scene, so it's certainly going on my calc.  Wonderful job!
I can't wait for Pawn Promotion.

Also, where's the calc serial number stored?

amazing, to think TI-Chess was so popular without an AI

You should still definetely put either link play or 2-player, though. It's more fun when you get to swear at your opponent and he has to listen.
I suck at chess.

Chess?

Pretty nice. The AI occasionally works surprisingly well for being so simple. More often it doesn't do too well though, I've seen it just leave pieces undefended and let me take them for no reason. I guess the Z80 probably isn't powerful enough for something super sophisticated, though.

One bug I noticed: Queenside castling is broken... it moved the wrong rook (from the h-file to the f-file, instead of a- to d-), and overwrote my bishop