White must remove his bishop from under attack and keep the night without the protection. However, it is necessary to choose the correct square for his bishop. 1.Bb3! Important for White to sacriffice his bisop on the b3 (see the line 2....Nxb3). [Thematic try 1.Ba4? Nc5+! (1...Kxe2? 2.Bb5+= ) 2.Kf5 Nxa4 (2...Kxe2? 3.Bc6 Nd3 4.Kg5! h3 5.Kh4! Nf2 6.Kg3 Kf1 7.Kh2= ) 3.Nf4 c5-+ (compare with 3...c5 in the line 2....Nxb3)] 1...Nc5+ 2.Kf5 Kxe2 [or also 2...Nxb3 and White draws sooner 3.Nf4 c5 4.Kg4 c4 5.Nd5! (5.Kxh4 c3 6.Nd5 c2-+ ) 5...Kd3 6.Nb6 c3 7.Nd5 c2 8.Nb4+= ] 3.Bd5 h3 4.Kg4 Nd3! 5.Kg3! [5.Kxh3? Nf4+-+ ] 5...Ke3 6.Bc6! Bloking the pawn c7 [6.Bc4? Nf4-+ ] 6...Nf4 7.Kg4 /Kh4 7...h2 8.Kg3 h1Q 9.Bxh1 c5 10.Bc6 c4 11.Bb5! [11.Ba4? Nd3 12.Bc2 Kd2 13.Bb1 Kc1-+ ] 11...Ne2+ [or also 11...c3 12.Ba4 Nh5+ (12...Ne2+? 13.Kg4! as in the next main line) 13.Kh4! (try 13.Kg4? Nf6+ 14.Kf5 Nd7 15.Ke6 Nc5+-+ ) 13...Nf6 14.Bc2= ] 12.Kg4 [Thematic try 12.Kg2? c3 13.Ba4 Nd4 14.Kg3 Kd2 15.Kf4 Ne6+ 16.Ke5 Nc5-+ wB must leave a line a4-d1] 12...c3 13.Ba4 Nd4 14.Kg5! [14.Kg3? Kd2 and Black wins as before] 14...Ne6+ [14...Kd2 15.Kf6! Nc6 16.Ke6 /f5=] 15.Kf6! Important logical choice of the king. The result of this move will be seen later [Thematic try 15.Kf5? Nc5 16.Bc2 Kd2 17.Bb1 Kc1 Black wins because wK has blocked the line b1-h7 (compare with the main line after 17...Bb1] 15...Nc5 16.Bc2 Kd2 17.Bb1!= (compare with the same move in the thematic try 15.Kf5?) [17.Bf5? Nd3-+ ]
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