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#Internet chess killer 3.1 uci engine code
These are the relevant code snippets and data declarations of the attack and x-ray attack getter in the C source, initialization omitted : Per line, a 12-bit index is composed of the 6-bit square index and a 6-bit occupancy key. A pre-initialized array of 8 times 4K bitboards (256 Kbyte in total) is used for attacks on ranks, files, diagonals and anti-diagonals in its lower half, while the upper half holds appropriate x-ray attacks. Since version 5, only the usual occupancy is used to map the masked line to an index, for files and diagonals by a north-fill multiplication and right shift as also applied in kindergarten bitboards, with the addition not only to lookup attack bitboards, but also X-ray attacks through the first blocking pieces (if any) of both ray-directions. OliThink pre 5 versions used rotated bitboards to determine sliding piece attacks. Move ordering considers PV-moves stored in a triangular PV-Table, SEE, killer- and history heuristic. It further applies flexible null move pruning, late move reductions, IID, singular reply-, check- and passed pawn extensions.
#Internet chess killer 3.1 uci engine windows
Something is just not right - it's not playing anywhere near 2000.OliThink's search relies on PVS without aspiration windows in its iterative deepening loop, along with a fixed sized transposition table. I outright blundered a piece and Leela just blundered a rook back in the next two moves. It will allow itself to be put into a mate in 1, even if it can postpone it for 5 more moves Also Leela doesn't try to delay mate at all, which is interesting. It outright missed a fairly obvious queen fork in the above game. Leela's tactical vision is totally negligible, though. My feeling is that Leela has incredible positional intuition, especially during parts of the game where I can see no plan for improvement. First one I lost due to an outright blunder (distracted). It somehow played into a mainline Fried Liver and thought it was even with its King on d6.Įdit: I just played two more games.
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It also vastly overstates its advantage in nearly every position. It certainly doesn't play like a 2000-level human right now, as it doesn't see basic 2-3 move tactics. Just played a game with the most recent version (2000 self-play Elo).