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Quite unusual and aesthetically pleasing position at the moment where Boleslavsky missed 61.Bf8 .

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Indeed, the pendulum swung wildly in both directions so many times during the game as to make one wonder.

<14...f4> -- with the view to a kingside attack. The immediate counter in the center 14...c5 appears more sound, yet it apparently has never been tried in master practice!

<17.hxg3> -- there was no need to fall in with Black's plans. The simple 17.Rf2 left White with a sizeable advantage. Now White has to show all his ingenuity to maintain a precarious balance.

<27.Be5> -- the first slip. It was essential to maintain the a2-pawn with 27.Be6+ and only then 28.Be5. Now White finds himself with a lost game.

<30...Qd2> -- Black's turn to go wrong. Either 30...Qb4 or 30...Qa3, not blocking the d-pawn, were much preferable. Now the chances are even.

<32.f5>-+ -- too hasty, 32.Re4 had to be played first.

<33...c3= -- Black should have opened the way for the d-pawn with 33...Qg5

<34.Ref4>-+ -- White missed a chance to force a draw by repetition here: 34.Bf4 Qb2/Qc2 35.Be5 and the black queen must return to d2 as White threatens Rg4

36...b4>= -- 36...c2 would have decided the game quickly.

<41.Bd4>? -- apparently playing for a win, White throws away an easy draw. 41.Bxg7+ Qxg7 42.Rxg7 Kxg7 43.f6! and if Black takes the pawn rooks come off the board whereas the remaining white bishop will have no trouble holding the queenside on its own. If Black doesn't take his rook or king will be tied to the advanced passed f-pawn's blockade and won't be able to help with a breakthrough on the queenside.

Now White is definitely lost.

<46...h6>? -- Black throws away the win again. True, something had to be done about 47.Bxf6+ but 46...Qf5, followed by 47...h5 was the way to deal with the threat. The queen would have kept three important squares -- f6, h5 and c2 -- under observation.

<51...Qb7>? -- and now White is winning again. 51...Qd7 was an instant draw: 52.Rgh3 (52.Bd1 c2) Qc6 53.Rg3 Qd7. Neither side has anything better than repeating moves.

<53.Bf4>= -- incomprehensible. After 53.Rgh3 Black is forced to trade his queen for this bishop.

<55...Rd8> -- wrong file, the rook needs to get to the first rank.

<51...Kg6> -- wrong rank, 51...Kf8 was better. Now White is winning again until the next incomprehensible move

<58.Bf4> -- keeping the black rook away from the first rank with 58.Rd5 seemed like a no-brainer. Now White got nothing. Again.

<59...Kg7??> -- walking into a mate in 11

<61.Bg5??>= -- as pointed out earlier, 61.Bf8 was a mate in eight.

<61...Rb1>+- -- 61...Ra1 was still =.