Author: Howard Exner
Date: 11:36:13 12/03/99
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On December 03, 1999 at 13:11:44, Robert Hyatt wrote: >On December 02, 1999 at 16:29:55, Howard Exner wrote: > >>These positions from the recent games posted by Enrique are about >>sacrificing pieces for pawns. In line with recent threads here about sacs that >>either fail or succeed, see what you make of these. >> >>Black played Ng5 and lost. The connected passed pawns on the Queenside for >>compensation >>were not enough this time, but given a similar position the sac may well have >>been justified. >>2r2rk1/1b3ppp/pq1b1n2/1pnPp3/1P2P3/2N2N2/3B1PPP/RB1QR1K1 b - b3 id "RTiger >>PII-300/64MB - Shredder 4 PIII-500"; am f6g4; > > > > >where did the above FEN come from? the "b3" on the end is wrong. There is >no possible en-passant capture on b3. I created the epd file from Rebel. I then edited the file and made the mistake during cutting/pasting - human error. > >Crafty never considers Ng4 here... It only considers Ncd7.. > >> >>Black played a5 but here looks like a good time to play g5. Black might squirm >>out of the checks and remain a piece up for two pawns. >>r3r1k1/p4bp1/1ppq3p/3nRQ2/3P1p1B/5N2/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500 >>- RTiger PII-300/64MB"; bm g7g5; >> > >g5 is all I get here: > > nss depth time score variation (1) > 6 0.37 0.44 1. ... g5 2. Qg4 Qg6 3. Nxg5 hxg5 4. > Bxg5 > 6-> 0.40 0.44 1. ... g5 2. Qg4 Qg6 3. Nxg5 hxg5 4. > Bxg5 > 7 0.78 0.49 1. ... g5 2. Qg4 Qg6 3. Bxg5 Rxe5 4. > Rxe5 hxg5 5. Nxg5 > 7-> 0.83 0.49 1. ... g5 2. Qg4 Qg6 3. Bxg5 Rxe5 4. > Rxe5 hxg5 5. Nxg5 > 8 2.38 0.41 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6 > 4. Qg4 Rad8 5. Ne6 > 8-> 2.64 0.41 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6 > 4. Qg4 Rad8 5. Ne6 > 9 4.14 0.38 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6 > 4. Qg4 Qf6 5. Ne6 f3 > 9-> 5.13 0.38 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6 > 4. Qg4 Qf6 5. Ne6 f3 > 10 10.11 0.41 1. ... g5 2. Bxg5 hxg5 3. Qg4 Qf6 4. > Rxg5+ Kf8 5. Ne5 Be6 6. Qh5 Rac8 > 10-> 11.54 0.41 1. ... g5 2. Bxg5 hxg5 3. Qg4 Qf6 4. > Rxg5+ Kf8 5. Ne5 Be6 6. Qh5 Rac8 > 11 18.48 0.30 1. ... g5 2. Bxg5 hxg5 3. Nxg5 Bg6 > 4. Qg4 Qf6 5. Ne4 Qg7 6. Nd6 <HT> > >>Black avoided g5 here also and I agree with that choice. >>r5k1/2r2bp1/1ppq3p/p2nN3/3PRp1B/7Q/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500 - >>RTiger PII-300/64MB"; am g7g5; >> >>Black plays g5 here and the game quickly ends in White's favour. > >crafty takes over 30 seconds to get off of g5, although the score is not good >after 3 seconds (-.12) It changes to another move at depth=12, 30 seconds, as >by that time, the score for g5 is down to -.6. The above comment goes with the >FEN above... not the one below here... > > > > >>r1r3k1/5bp1/1ppq3p/p2n4/3PRp1B/5N1Q/PP3PPP/4R1K1 b - - id "Shredder 4 PIII-500 - >>RTiger PII-300/64MB"; am g7g5; > > >g5 drops at depth=11, after 10 seconds... It then switches off of that to >Rf8 and then Qc7... So we concur on all the above as to when or when not to sacrifice.
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