Section A1 – Win
1.Qc1+!
Foresight effect for nine moves!
( Main thematic try: 1.Bc3+? Kb1 2.Qb4+ Qxb4+ 3.Bxb4 Rd5+ 4.Kb6 Bg1+ 5.Kc6 Rfd8 6.Be7 Ba7 Here White cannot take the f6 pawn with tempo. 7.Bxd8 Rxd8 8.Ne7 Rd2!
( 8…Bb8? 9.Kb5 Rd7 10.Nc6 Bxf4 11.Kc4 Rxb7 12.axb7 +- )
9.Kc7 Ra2 10.Nc6 Rxa6 11.Nxa7 Rxa7 12.Kc8 Rxb7 =, quiet )
1…Ka2 2.Qc2+ Ka3
( 2…Ka1 3.Bc3+ Rxc3 4.Qxc3+ Kb1 5.Nxf8 +- )
3.Qa4+
( loss of time 3.Qc1+ Ka2 4.Qc2+ Ka3 )
3…Kb2 4.Qb4+ Qxb4+
( 4…Kc2 5.Qxd6 Rxd6 6.Nxf8 +- )
5.Bxb4 Rd5+
( 5…Re8 6.a7 Rd5+ 7.Ka4 Rdd8 8.Kb5 Bg1 9.Bc5 Bxc5 10.Kxc5 +- )
6.Kb6 Rfd8
( 6…Bg1+ 7.Kc6 Rfd8 8.Be7 Ba7 )
7.Be7 Bg1+
( 7…Re8 8.a7 Bg1+ 9.Kc6 Bxa7 10.Kxd5 +- )
8.Kc6 Ba7
Compared to the Main thematic try, here the king is on square b2.
9.Bxf6+!
check! Black has a choice: where should the king move? B:
9…Kb3
( A: 9…Ka3 10.Bxd8 Rxd8 11.Ne7 Rf8 12.Nc8 Rf6+ 13.Kd7!
( But not 13.Kd5? Rxa6 14.Nxa7 Rb6 15.Nb5+ Rxb5+ 16.Kc6 Rb4 17.f5 Rc4+ =, quiet )
( Loss of time 13.Kc7 Rf7+ 14.Kc6 Rf6+ 15.Kd7! )
( 13.Kb5? Bb8 14.a7 Bxa7 15.Nxa7 Rxf4 =, quiet )
13…Rxa6 14.Nxa7 Rxa7 15.Kc8 /Kc6 15…Rxb7 16.Kxb7 The black king from square a3 cannot delay the pawn. 16…Kb4 17.Kc6 +- )
10.Bxd8 Rxd8 11.Ne7 Rf8 12.Nc8 Rf6+ 13.Kd5!
Change of solution!
( Thematic try: 13.Kd7? Rxa6 14.Nxa7 Rxa7 15.Kc8 Rxb7 16.Kxb7 Kc4 17.Kc6 Kd4 18.f5 Ke5 =, quiet )
( 13.Kc7 Rf7+ 14.Kd6
( 14.Kc6 Rf6+ Loss of time )
14…Bb8+! 15.Ke6 Rxf4 16.a7 Bxa7 17.Nxa7 Rb4 =, quiet )
13…Rxa6 14.Nxa7 Rb6 15.Nc6! Rxb7 16.Na5+
The b3 square for the black king turned out to be mined!
16…Kc3 17.Nxb7 +-
In study, a synthesis of two themes is implemented: the effect of foresight and change of solution. On the first move, White makes the right choice and forces the black king to occupy the b2 square. Then they use this circumstance on the 9th move. The choice of the square for the white king to retreat from the rook check on the 13th move depends on the choice of the square for the black king to retreat from the bishop check on the 9th move.
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