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Member since May-05-08 · Last seen Oct-16-18
I had a chess analysis website ( for about 10 years until 2017. Now, with improved software (Stockfish 9) and improved hardware (AMD Threadripper 1950X with 16 cores and 32 GB of memory), some of those chess positions that were inpenetrable 10 years ago can be solved (maybe).

   CharlesSullivan has kibitzed 211 times to chessgames   [more...]
   Oct-14-18 Spassky vs Fischer, 1972 (replies)
CharlesSullivan: < Was 23.Re3 winning for White? > Reshevsky calls White's 23.e5 a "questionable idea." Ivo Nei says that it was "nervously played." Timman says that it "opens the position for no particular reason." Byrne's comment is the strongest: "This is a silly stunt in a ...
   Sep-27-18 Fischer vs Spassky, 1972 (replies)
CharlesSullivan: <Tiggler> < I would appreciate a bit more information on the total effort involved in his analysis, and about his hardware. > Tiggler, thanks for your comment. I have an AMD 16-core Threadripper 1950X with 32 GB of memory and all the important 6-man Syzygy ...
   Sep-26-18 Fischer vs Spassky, 1972 (replies)
CharlesSullivan: < Further Errors, But -- No Harm, No Foul > After Fischer escaped retribution for his 20.Bf4 blunder, he thought for 8 minutes and landed in the soup again with another weak move: 21.Bb5 lost a pawn to 21...Qxb2 22.Bxc6 Nc3! Stockfish says that White should have ...
   Sep-23-18 Spassky vs Fischer, 1972 (replies)
CharlesSullivan: < Addendum: Was 36...Red8 also winning? > At move 36, where Black played 36...b5 (which would have allowed White to equalize with 37.c4) [see analysis above] , I first looked at 36...Red8 [DIAGRAM] because Kasparov said, "It would have been better to play ...
   Sep-14-18 Fischer vs Spassky, 1972 (replies)
CharlesSullivan: Robert Byrne called White's 35th move "careless," and he's right -- best is 35.Nxc5 and the game is still equal. Byrne then pointed out the strongest game continuation for Black was 35...Nce4! He continued, "I see nothing better for Bobby than 36.Ra1 Rc8 37.Bxe4 Nxe4 ...
   Sep-12-18 Spassky vs Fischer, 1972 (replies)
CharlesSullivan: The complexity of this game has been underappreciated. Spassky's 12.Bh4 started him on the road to a lost game. He should have played 12.Bxf6 with approximately equal chances. Spassky would have had better chances with 18.Qf4 Rxc8 19.Qxh4, although after 19...Qa4 ...
   Sep-12-18 Spassky vs Fischer, 1972
CharlesSullivan: <Howard> Even using Stockfish 9 and a 16-core AMD Threadripper, my conclusions are not much different from those of Kasparov[2004] or Timman[2009] or (<RandomVisitor[2013] > or <Hesam7[2013] >. 1. I agree with Kasparov that Petrosian's 14...Nc6 leads to ...
   Sep-04-18 Fischer vs Spassky, 1972 (replies)
CharlesSullivan: <Howard><In Yasser's book Winning Chess Brilliancies ...> I usually don't comment about opening issues, but here goes... In <Reshevsky on The Fischer-Spassky Games>, Reshevsky assigned two question marks to Spassky's 16...Ra7 and wrote, "A seriously (sic)
   Sep-04-18 Spassky vs Fischer, 1972 (replies)
CharlesSullivan: <beatgiant><White should avoid being forced to make the a5 pawn push ...> You are correct, Black wants to force White to lock the queenside pawns so that Black's king can reach the stalemate position near the a8-square. As we both noted, once White played 46.a5,
   Aug-28-18 Fischer vs Spassky, 1972 (replies)
CharlesSullivan: 3. Third Missed Win As Timman pointed out (in Fischer World Champion!), Fischer should have played 28.b4!! axb4 29.axb4 Bxb4 and now 30.Bf1! (instead of Timman's 30.Be2) would have allowed White to hold the position. But Fischer actually played 28.Nb5 which led to ...
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