TCEC 10

[schack]

Are the changes in 6.03 limited to this stalemate issue?

[cc2150dx]

Thanks for the update, Robert!

[Houdini]

Are the changes in 6.03 limited to this stalemate issue?

Yes, it's a minor correction.
The fact that this problem has remained undetected for over a year suggests that it's not occurring very frequently.

Robert

[shrapnel]

Are the changes in 6.03 limited to this stalemate issue?

Let's hope for a "Butterfly Effect "

[Nordlandia]

Are the changes in 6.03 limited to this stalemate issue?

Let's hope for a "Butterfly Effect "

+1 🦋

[styx]

Houdini 6.03 corrects a stalemate bug which was reported to me this weekend. It occurs when there are white pawn captures available, for example this position:
[d]8/3R1pk1/5p1p/5PbK/B2p2PP/3P4/1r6/8 w - - 0 1

Try this position with the previous Houdini 6, set multi-PV to 4. You will get some surprising results .

The error was already present in Houdini 5, but apparently nobody has ever noticed it.

Robert

out of curiosity: what was the engine output? non-houdini user here

[Geonerd]

Stockfish is first engine, which goes WHOLE season UNBEATEN!! No word on that in chessdom page?

Let's compare.

Komodo goes undefeated in the chess.com speed championship but misses qualifying for the final by .5 points. This goes unreported in the chess.com website. No one cares.

Stockfish goes undefeated in TCEC but misses qualifying for the final by .5 points. This goes unreported on the chessdom.com website. People freak out.

+1
The contempt that made Stockfish remain unbeaten was the same that did not allow him to add the necessary points. Surely with the right contempt Komodo and Houdini would also be unbeaten.

There's no doubt a bit of Game Theory and second-guessing going on here between the various programmers. Setting contempt too high, relative to the other engines, can cost unnecessary losses, while setting it too low costs wins. Ya pay yer money and you take yer chances!

[Geonerd]

Quite an interesting game (#2, move 54) unfolding now. Wonderfully speculative, active play by H has given him space and very active pieces, but K is 2 solid pawns up. If K can untangle...

[Norm Pollock]

I looked to see if the Fizbo fiasco had a ripple effect on the results in round 2.

The beneficiary Booot scored the same vs the Big Three (0.5/2.0). No effect on the results of round 2.

[Norm Pollock]

correction:

the results were
Booot 3.0/12
K-S-H 3.0/4

same conclusion- Booot did not influence eventual outcome.