The 1970 National Open in Sparks, Nevada was exceptionally strong and the outcome was in doubt until the last round was finished. When the dust settled Larry Evans and Arthur Bisguier both had 7-1 scored and shared top homors.
Evans played his usual steady, unspectacular chess and going into the last round had won six and drawn one, In the last round his opponent was National Master Bruch Pandolfini. Bisguier was playing National Master Walter Cunningham. Bisguier took a quick draw and after an exciting game, Evans and Pandolfini finally agreed to a draw.
Bisguier played his usual exciting and dangerous chess and had some incredible luck in the 7th round when he played Kenneth Smith.
At move 13 Bisguier carelessly castled, normally a good thing, but at that moment it gave Smith the opportunity to win a piece for nothing. Even though he lost a piece Bisguier didn’t resign. He fought back, recklessly throwing everything he had at Smith even though it exposed his own King. Just when it looked like Smith had a mate the incredible happened...Smith managed to lose! Take a look...
A game that I liked (Fritz 17)
Kenneth Smith–Arthur Bisguier0–1A00National Open, Reno, Nevada1970Stockfish 16
Scotch Gambit 1.e4 e5 2.f3 c6 3.d4 exd4 4.c3 Smith was true to his
convictions that you should play gambits and it took considerable fortitude to
play this against Bisguier, himself a fearless attacking player. dxc3 5.xc3 5.c4 Even though this results in sharp play with equal chances,it's a bit
much even for Smith! cxb2 6.xb2 b4+ 7.c3 f6 8.0-0 d6 9.d5 equals 5...d6 6.c4 e6 A prudent move; it blunts white's B and exchanges lessen
white's attacking possibilities. 6...f6 is the other way. 7.b3 d7 8.g5 e5 9.b5 c6 10.f4 cxb5 with equal chances. 7.xe6 fxe6 8.b3 d7 9.xb7 This regains the P but puts the Q out of play. Also possible was the
more conservative 9.O-O b8 10.a6 e7 11.0-0 White's position is not
without promise. f6 Against e5 12.d1 ge7 13.e2 White needs to defnd
the b-Pawn so he can develop his B on c1. 0-0 This careless move looks
logical, but it's not; white has a decisive advantage. 13...xc3 14.bxc3 0-0 15.a3 e5 16.c4+ h8 17.ab1 b6 is equal. Noetzel,F (2090)-Oberhofer,
A (2308) Berlin GER 2011 13...g6 14.e3 xc3 15.bxc3 0-0 Draw agreed.
Papaioannou,I (2470)-Nikolaidis,I (2565) Athens 1997 14.e5 ...winning a
piece! xe5 15.xe5 c8 15...xe5 16.xe5 White has won a piece. 16.g4 xc3 17.bxc3 Kenneth Smith was a strong mater and there is no way he can
lose this game even to a GM! d5 18.d3 The R is added to the attack. h5
Bisguier was not one to sit idly by and do nothing so he attacks even if it
exposes his K. 18...e7 19.c4 e5 19.h6+ Destroying the
King's house. gxh6 19...h8 is just as bad. 20.xh5 f6 21.h4 20.xh5 Threatening mate with Rg3+. f6 21.g3+ 21.xh6 packs an even harder
punch. e8 22.g3+ h7 23.g7+ h8 24.g5 Of course white is winning. 21...h7 22.xh6 Threatening mate with Bd2+ e8 23.g7+ h8 24.h4 This si a major slip. White's still better, but the sure win
is gone. 24.g5 This is the winner...the intention is to play Rh7+! and
mate with Qg7 f8 25.e1 e7 26.g8+ wins outright. 24...g6 25.xg6 xg6 There's no good discovered check, but white is P up so he still has the
advantage, but there is still a lot of work to be done. 26.e1 b1 Just
like that...white has to think about the safety of his own King! Even so he
still has what should be a decisive advantage. 27.c1+ g7 28.c4 While not
bad, this move leaves white's K compromised. Therefore it would have been
prudent to create an escape square with 28.h3 f6 29.h3 29.h6+ might
have been worth a try. Black can't trade Qs. f7 29...xh6 30.xh6+ xh6 31.xb1 White is winning. 30.xg6+ xg6 31.d2 b2 32.a5 c2 33.xc7 d5 34.f4 xc4 White still has his work cut out for him in order to score
the point. 29...f7 30.f4 At this point it's a whole new game because
black has equalized and now it's a strong Master against a GM...the odds favor
the GM! 30.g4 This would have kept his hopes alive. e5 31.g2 a1 32.g3 xa2 33.b3 c2 34.f3 with the slightly better prospects. 30...c2 31.g4 And now g5 would win. e5 32.e3 xc4= 33.g5 g8 34.f4 exf4 34...xf4 35.f1 35.f1 This is a gross blunder that loses
immediately.. 35.e8+ would draw. g7 36.d7+ h8 37.g6 c5+ 38.h1 h5 39.g1 xc1 40.xc1 f3+ and black should take the draw. 35...xf1+
White resigned. Stockfish informs that there is a mate in 21! 35...xf1+ 36.xf1 fxe3 37.e2 xc1 38.xe3 c3+ 39.d2 a3 40.c2 xa2+ 41.b3 h2 42.c4 e7 43.b3 xh3+ 44.b4 g6 45.c4 xg5 46.b4 h4+ 47.c3 c5 48.d3 a5 49.e2 a4 50.d2 b4 51.e2 a3 52.f3 a2 53.e2 a1 54.f3 b3+ 55.g2 a2+ 56.h1 b1# 0–1