Is Fischer Time Implemented Correctly?

[RandyR]

I don't know why I didn't notice this before but I think our implementation of the starting time on the clock is wrong. If I select 15 10 in Fischer time, the clock has starting times of 0:15.10  0:15:10 and after the first move for White it changes to 0:15.20  0:15:10 and Black's time starts decreasing. I think there's an extra increment added as the starting times, which I believe should be 0:15.00  0:15.00.

Am I wrong or did we change something and just didn't notice it?

Randy

[Dirk]

Oh - you are absolutely right that shouldn’t be correct.

Von meinem iPad gesendet

Am 25.09.2025 um 16:37 schrieb RandyR <randy...@gmail.com>:

I don't know why I didn't notice this before but I think our implementation of the starting time on the clock is wrong. If I select 15 10 in Fischer time, the clock has starting times of 0:15.10  0:15:10 and after the first move for White it changes to 0:15.20  0:15:10 and Black's time starts decreasing. I think there's an extra increment added as the starting times, which I believe should be 0:15.00  0:15.00.

Am I wrong or did we change something and just didn't notice it?

Randy

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[RandyR]

It's in the timecontrol.py reset(self) function:

125        elif self.mode == TimeMode.FISCHER:
126            self.clock_time[chess.WHITE] = self.clock_time[chess.BLACK] = self.game_time * 60 + self.fisch_inc

I created a PR in your repo. Maybe Johan can adjust his fork as I don't know Git well enough to PR another fork (I think it's something like 'git remote add Johans_v4_repo https://github.com/JohanSjoblom/picochess' then checkout, etc).

Randy

[Johan Sjöblom]

This is so nicely served on a silver plate so I can adjust V4.