I think this has something to do with futility pruning/razoring.
[pgn]
[Event "Computer Chess Game"]
[Site "LAPTOP-1FK7MTIP"]
[Date "2019.11.25"]
[Round "-"]
[White "SchaakMachine"]
[Black "Fairy-Max 4.8V"]
[Result "0-1"]
[TimeControl "120"]
[Annotator "1. +0.22 2... +0.08"]
1. e4 {+0.22/8} c5 2. Bc4 {+0.34/7 2.4} Qb6 {+0.08/7 2.4} 3. Qh5
{+0.80/6 2.3} g6 {+0.04/9 5} 4. Qd5 {+0.94/5 2.3} Nh6 {+0.03/8 2.4} 5. d3
{+1.01/6 2.2} Nc6 {+0.22/8 2.4} 6. Bxh6 {+1.07/6 2.2} Qxb2 {+2.10/10 1.9}
7. Qxf7+ Kd8 {+2.20/10 2.3} 8. Bxf8 {-2.46/7 2.1} Qc1+ {+79.98/28 0.2} 9.
Ke2 {+5.94/1 2.0} Nd4# {+79.99/28 0.1}
{Xboard adjudication: Checkmate} 0-1
[/pgn]
Skippers greatest games: futility pruning
Moderators: hgm, Dann Corbit, Harvey Williamson
-
Henk
- Posts: 7210
- Joined: Mon May 27, 2013 10:31 am
Re: Skippers greatest games: futility pruning
Yet another great Skipper game. I still have forgotten to change name back into Skipper.
[pgn] [Event "Computer Chess Game"] [Site "LAPTOP-1FK7MTIP"] [Date "2019.12.03"] [Round "-"] [White "SchaakMachine"] [Black "Fairy-Max 4.8V"] [Result "0-1"] [TimeControl "120"] [Annotator "1. +0.03 4... -0.02"] 1. e4 {+0.03/8} e5 2. d4 {+0.02/6 2.4} exd4 3. Qxd4 {+0.22/8 2.3} Nc6 4. Qa4 {+0.11/6 2.3} Nf6 {-0.02/8 7} 5. Bb5 {+0.14/6 2.2} Ne5 {+0.00/7 4} 6. Bg5 {-0.06/6 2.2} c6 {+0.30/9 2.6} 7. Bd3 {-0.07/6 2.1} Qb6 {+0.38/8 4} 8. b3 {-0.18/5 2.1} Bb4+ {+1.98/8 2.2} 9. Nd2 {-1.17/6 2.1} Qd4 {+2.27/9 2.7} 10. O-O-O {-1.06/5 2.0} b5 {+6.28/9 2.2} 11. Bxb5 {-3.76/6 2.0} cxb5 {+6.54/9 1.8} 12. Qxb5 {-5.18/6 1.9} Ba3+ {+79.98/28 0.1} 13. Kb1 {-3.00/2 1.9} Qb2# {+79.99/28 0.2} {Xboard adjudication: Checkmate} 0-1 [/pgn]
[pgn] [Event "Computer Chess Game"] [Site "LAPTOP-1FK7MTIP"] [Date "2019.12.03"] [Round "-"] [White "SchaakMachine"] [Black "Fairy-Max 4.8V"] [Result "0-1"] [TimeControl "120"] [Annotator "1. +0.03 4... -0.02"] 1. e4 {+0.03/8} e5 2. d4 {+0.02/6 2.4} exd4 3. Qxd4 {+0.22/8 2.3} Nc6 4. Qa4 {+0.11/6 2.3} Nf6 {-0.02/8 7} 5. Bb5 {+0.14/6 2.2} Ne5 {+0.00/7 4} 6. Bg5 {-0.06/6 2.2} c6 {+0.30/9 2.6} 7. Bd3 {-0.07/6 2.1} Qb6 {+0.38/8 4} 8. b3 {-0.18/5 2.1} Bb4+ {+1.98/8 2.2} 9. Nd2 {-1.17/6 2.1} Qd4 {+2.27/9 2.7} 10. O-O-O {-1.06/5 2.0} b5 {+6.28/9 2.2} 11. Bxb5 {-3.76/6 2.0} cxb5 {+6.54/9 1.8} 12. Qxb5 {-5.18/6 1.9} Ba3+ {+79.98/28 0.1} 13. Kb1 {-3.00/2 1.9} Qb2# {+79.99/28 0.2} {Xboard adjudication: Checkmate} 0-1 [/pgn]
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Henk
- Posts: 7210
- Joined: Mon May 27, 2013 10:31 am
Re: Skippers greatest games: futility pruning
Only counting material.
[pgn] [Event "Computer Chess Game"] [Site "LAPTOP-1FK7MTIP"] [Date "2019.12.30"] [Round "-"] [White "Skipper"] [Black "Fairy-Max 4.8V"] [Result "1/2-1/2"] [TimeControl "60"] [Annotator "1. +0.00 1... +0.12"] 1. Na3 {+0.00/13} c5 {+0.12/8 2.1} 2. Nb1 {+0.00/10 1.2} d6 {+0.09/8 3} 3. Na3 {+0.00/11 1.2} Nf6 {+0.12/8 1.4} 4. Nb1 {+0.00/11 1.1} Nc6 {+0.02/8 2.7} 5. Na3 {+0.00/10 1.1} Nb8 {-0.01/8 0.7} 6. Nb1 {+0.00/13 1.1} Be6 {+0.01/8 0.9} 7. Na3 {+0.00/9 1.1} Bc8 {-0.01/8 0.7} {XBoard adjudication: repetition draw} 1/2-1/2 [/pgn]
[pgn] [Event "Computer Chess Game"] [Site "LAPTOP-1FK7MTIP"] [Date "2019.12.30"] [Round "-"] [White "Skipper"] [Black "Fairy-Max 4.8V"] [Result "1/2-1/2"] [TimeControl "60"] [Annotator "1. +0.00 1... +0.12"] 1. Na3 {+0.00/13} c5 {+0.12/8 2.1} 2. Nb1 {+0.00/10 1.2} d6 {+0.09/8 3} 3. Na3 {+0.00/11 1.2} Nf6 {+0.12/8 1.4} 4. Nb1 {+0.00/11 1.1} Nc6 {+0.02/8 2.7} 5. Na3 {+0.00/10 1.1} Nb8 {-0.01/8 0.7} 6. Nb1 {+0.00/13 1.1} Be6 {+0.01/8 0.9} 7. Na3 {+0.00/9 1.1} Bc8 {-0.01/8 0.7} {XBoard adjudication: repetition draw} 1/2-1/2 [/pgn]