The somewhat awkward 13…♘e5 was better, preventing White’s plan, though White is still better after the persistent 14.f4 ♘5c6 15.♕g4.
Planning to follow up with ♗c1-h6, but other moves were equally good here.
12…♘fxd5 prevents the pin by ♗c1-g5, but allows 13.a3, and 12…♗xd5 13.♗g5 boils down to the same thing.
‘Black’s position resembles a prisoner tied by his legs and arms’ – Krogius.
13…♗e7 14.♗xf6 gxf6 15.♘xd5 ♗xd5 16.♗xd5 exd5 17.♘d4 ♔f8 18.♘f5 h5 19.♖xd5 ♕xd5 20.♕xe7+ ♔g8 21.♕xf6 1-0
14…♗xe4 can be answered with 15.♘d2 as well, or with the simpler 15.♗e2. After the suggested continuation:
when Kan concluded that Black is just fine with two pawns for the exchange, the pair of bishops and a superior pawn structure, and White should play accurately to maintain the balance. In the game, Ufimtsev was not up to the task, and Kan won, thus qualifying for the USSR Championship.