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[Event "Villarrobledo op"] [Site "Villarrobledo"] [Date "1997.08.23"] [Round "5"] [White "Shirov, Alexei"] [Black "Ljubojevic, Ljubomir"] [Result "1/2-1/2"] [BlackElo "2565"] [ECO "B81"] [Opening "Sicilian"] [Variation "Scheveningen, Keres, Perenyi Attack, 7...h6 8.f4"] [WhiteElo "2700"] [TimeContro...

I'm working the code for an MCTS implementation. I'm coding Tic-Tac-Toe as an easy GAME to work out the bugs. I'm running into a situation where either: 1. The code is working fine and i'm just not sure what to do 2. I haven't implemented something correctly (usually this one! LOL) The question has ...

Houdini 1.5a finds it. FEN: q4bk1/pb4p1/1p2pp2/3n3p/2NP4/1P3BP1/PB3P1P/R1R3K1 b - - 0 1 + Houdini 15a: 4 00:00 3k 0 +0.18 1. ... h4 2.Ne3 Nxe3 3.Bxb7 Qxb7 4.fxe3 hxg3 5.hxg3 5 00:00 5k 0 +0.22 1. ... h4 2.Be4 b5 3.Ne3 Nxe3 4.Bxb7 Qxb7 5.fxe3 hxg3 6.hxg3 6 00:00 13k 0 +0.35 1. ... h4 2.Be4 Nb4 3.Bb1 ...

Equinox 3.30 finds it! FEN: q4bk1/pb4p1/1p2pp2/3n3p/2NP4/1P3BP1/PB3P1P/R1R3K1 w - - 0 1 + Equinox 3.30: 10 00:00 53k 1,722k +0.36 0. ... Nb4 1.Bxh5 Nd3 2.Bg4 f5 3.Be2 Nxc1 4.Rxc1 Bf3 5.Bxf3 Qxf3 6.Ne5 Qe2 11 00:00 69k 1,461k +0.32 0. ... Nb4 1.Be2 Bf3 2.Bf1 Nc6 3.Nd2 Bd5 4.Bd3 Qc8 5.Ne4 Bb4 12 00:00...

Critter 1.6a finds it. FEN: q4bk1/pb4p1/1p2pp2/3n3p/2NP4/1P3BP1/PB3P1P/R1R3K1 w - - 0 1 + Critter 1.6a: 2 00:00 723 0 +0.32 0. ... Qe8 1.Kg2 3 00:00 1k 0 +0.15 0. ... Qe8 1.Ne3 Bb4 2.Nxd5 Bxd5 3.Bxd5 exd5 3 00:00 2k 0 +0.24 0. ... h4 1.gxh4 Qe8 2.Be4 4 00:00 3k 0 +0.25 0. ... h4 1.Ne3 Nxe3 2.Bxb7 Qx...

I think you should consider converting your current format into something more efficient. See for example https://github.com/sshivaji/polyglot - supports reading/writing Polyglot book format (GPL). --Jon I agree. There are many FREE tools out there to create and maintain opening books in the polygl...

When an engine doesn't use EGTBs or if they are disabled, what is a good rule about when to / when not to call QSearch prior to calling specialized endgame code, such as a mop-up routine? I'm proceeding with the premise that if the number of pieces is left is low enough to trigger endgame code, then...

I had forgotten about it, but Arena has support for ISC.

I just tested logging in to winboard.nl using Arena and it connected me OK.
Does/has anyone used Arena rather than winboard?
if so, can you pass along any suggestions as to how Arena should be configured to insure a smooth experience?

are these solvable mates?

1. "We" have one bishop, and the goal is to make it easier for it to move around, so we want more of our pawns on the opposite color. we can't control what the opponent does. 2. if we have zero or 2 pawns, then moving around pawns doesn't help our bishops, but, it can punish the opponent's single b...