White's position, nearly equal at move 13, became definitely inferior with his inaccurate 13th, 14th, 15th, & 16th moves.

At move 13, the variation (-.41) (22 ply) 13.Qc2 d5 14.Na4 d4 15.Ba3, was inferior to 13.Rc1.

At move 14, the variation (-.52) (19 ply) 14.e4 d4 15.Nce4 c5 16.Rfe1, was slightly inferior to 14.Na4 d4 15.Ba3.

At move 15, the variation (-.74) (21 ply) 15.exd4 exd4 16.Nce4 c5, was slightly inferior to (-.66) (21 ply) 15.Nce4 c5 16.Rfe1.

At move 16, the variation (-.87) (20 ply) 16.Na4 c5 17.Bxb7 Qxb7 18.Rae1, was slightly inferior to (-.74) (20 ply) 16.Nce4 c5 17.Nxf6+ Nxf6 18.Bxb7 Qxb7 19.Rae1.

White's series of four (moves 13-16) slightly inaccurate moves, have placed him in an extremely difficult position.

The tournament book noted after 16.Na4, <The White knight moves out of play, and Black achieves a decisive advantage. Better was 16.Nce4 with subsequent exchanges...>.

Instead, White erred slightly with 19.Bc1?. Fritz indicated the following evaluation and continuation: (-93) (21 ply) 19.Bc1? Re8 20.Nb2 Bh6 21.Nd3 Ng4 22.h3 Bxd2 23.Rxe8+ Rxe8 24.hxg4.

At move 20, the tournament book indicated White's best move was 20.Nb2. Fritz also preferred 20.Nb2, but upon a deeper evaluation Fritz indicated 20.Nb2 and 20.Qd1 were approximately equal choices.

At move 22, White's best chance was: (-.88) (20 ply) 22.f4 Nd3 23.Re2 Re3 24.Rxe3 dxe3 25.Qe2 exd2 26.Qxd3 Ne4 Bb2 Re8 28.Be5, with some chances to save the game, probably by transferring his Knight to d5.

Instead, White played 22.h3?, which Fritz evaluated as: (-1.53) (19 ply) 22.h3? Nh5 23.Re4 Bh6 24.Rxe5 Rxe5 25.Nf3 Rf5 26.Nh4.

After 22.h3?, White had no further opportunities to save the game.

A very well played game by Flohr, who took excellent advantage of Stahlberg's series of small errors.