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I've never been able to get any gain from singular extension so I don't use it in Wasp. I must not be implementing it correctly or it doesn't play nicely with my extensions and reductions.

John

Hi Jon, Good position! Coincidentally, I was experimenting will null-move reduction yesterday on a similar endgame with only one minor per side. Here is the position 8/p2b2p1/3P1p2/4k3/1B5P/3K4/8/8 b - - In Wasp I allow NMP if the side to move has one or more pieces. If the null-move search fails hi...

In Wasp I get some benefit by storing positions in Qsearch at depth=0, but only if a move increased alpha. I probe the hash table for depth >= 0.

John

Thanks Ferdy. I'm working on fixing this for the next release.

John

I made a change where if the first move at the root fails low several times (score has dropped about 2 pawns or more) then I accept that score for the first move, set a flag, and search the remaining moves to see if one of them is better. If not, then I repeat the iteration. Looks more like a hack ...

Tried testing it with UCI_Elo 1500 at TC 60s+100ms and it losses on time forfeit. Sample games: Hi Ferdy, Thanks for bringing this to my attention. Wasp handles the UCI_Elo command by reducing the nodes/second. At 1500 Elo the target search rate is only about 24 nodes/second. In my time handling ro...

Hi Frank! Thanks for pointing out these games to me. I don't spend nearly enough time reviewing games. In the Hakkapeliitta-Wasp game, after white played 20. Qh6, Wasp thinks Qc7 is a draw until it fails low at depth 23 (in about 6 sec). Wasp continues to reduce alpha and re-search many times until ...

I forgot to mention that my eval hash table is separate from my main hash table and it includes the danger[] term in addition to the overall evaluation.

John

In Wasp I have an evaluation term called danger[side] which is used in the Search() routine to restrict pruning. The danger[] term gets increased by some amount for features such as a piece attacked by enemy pawn or a pawn/piece which is attacked and undefended, enemy having a free pawn on 5th rank ...

Hi Ted, I agree. Wasp is 3028 on the latest CCRL list, I have it at 2845 on my Raspberry Pi 3b+. The wasp.uci code shows the top level at 2654 191 elo lower. So 1556 could be 1765, unless there’s an equation to work out the levels difference rather than deduct 191 throughout. Al. Here are the equat...