1.Bf8+!
Right switch of the white battery by bishop. Other selections are given the chance make effective attack to wB [Thematic try 1.Bd6+?
"Study in the Study"-BTM, draw: 1...Kb1
2.Ra3
Rb6!
3.Be5
(3.Bf8
Rg6
4.Kd7
Rg3=
; 3.Kd7
(c7) 3...Kc1
4.Rd3
Rxd6+!!
5.Kxd6
b1Q
6.Rd1+
Kb2=
) 3...Rb5
(3...Kc1?
4.Rd3
b1Q
5.Rd1#
) 4.Bd4
Rb4
5.Bc3
Rb5!
(5...Re4?
6.Nd1
Kc2
7.Nxb2+-
) 6.Bd4
Rb4
7.Be5
Rb5
positional draw, or 8.Bf6
Rb6
9.Bg7
Kc1!
10.Rd3
Rb8+!!
11.Kc7
Rb7+
12.Kc6
Rb6+
13.Kc5
Rb5+
14.Kc4
Rb4+
15.Kc3
Rb3+
16.Kxb3
b1Q+
17.Kc4
Qa2+
18.Kb4
Qb1+
positional draw by perpetual check; Thematic try 1.Be7+?
Kb1
(1...Kb3?
2.Ra3#
) 2.Ra3
Rb6
3.Kd7
Rb7+
4.Kd6
Kc1
5.Rd3
b1Q
6.Rd1+
Kb2
] 1...Kb1
2.Ra3!
[2.Ba3?
Re5!=
(2...Ka2?
3.Bf8+!!
main line) ] 2...Rb6!
[2...Re5
3.Bg7
Re8+
4.Kd7+-
; 2...Rg5
3.Bd6
Kc1
4.Rd3
Rg1
5.Ba3
-pin and win] 3.Kd7!
[Try 3.Bg7?
Kc1!
4.Rc3+
Kd2
mirror play wK & bK (see main line 3.Kd7!) 5.Nc4+
Ke2
(see main 4.Ke7!) 6.Re3+
(6.Rc2+
Kd3
7.Rc3+
Ke2
positional draw) 6...Kf2
(see main 5.Kf7!) 7.Nxb2
Rxb2=
(7...Kxe3?
8.Nc4+
- fork) ] 3...Rf6
4.Ke7!
[4.Bg7?
Rf7+=
; 4.Bc5?
Rf4!
(4...Rf3?
5.Bd4+-
) 5.Kd6
Re4=
; 4.Bd6?
Kc1=
] 4...Rg6!
for Rg3 [main 4...Rc6
5.Kf7!!
(5.Kd7?
Rf6
6.Ke7
loss of time) 5...Rc2
6.Bd6!
(6.Ke6?
Re2=
-pin) 6...Re2
(6...Kc1
7.Rd3
b1Q
8.Ba3++-
) 7.Be5
Kc1
8.Rd3
Rxe3
9.Bxb2+!+-
; or also 4...Kc1
5.Rd3
Rf1
6.Kd7!
switchback (6.Ke6?
Re1!
-pin 7.Ba3
-pin 7...Kb1=
) 6...Re1
7.Ba3!
-pin 7...Kb1
8.Nc4
Kc2
9.Nxb2+-
] 5.Kf7!
[5.Kd7?
Rg3!
6.Bc5
Rxe3=
] 5...Rc6!
[5...Rg3
6.Bg7+-
] 6.Bb4!
[6.Be7?
Rc7!
-pin=; 6.Kg8?
Rc8
-pin= (6...Rc2?
7.Bd6!
Re2
8.Be5
Kc1
9.Rd3+-
) ] 6...Rc7+
[6...Rb6
7.Bc5!
(7.Be7?
Rb7
-pin 8.Kf8
Rb8+
9.Kf7
Rb7
positional draw) 7...Kc1
8.Rd3+-
; 6...Rc2
7.Bd6!
Kc1
8.Rd3!+-
] 7.Ke6!
Rc2
main B [main A 7...Kc1
8.Rd3
b1Q
9.Ba3+
Qb2
10.Rd1#
] 8.Kd5!
[8.Bd6?
Rc6!
-pin = (8...Re2?
-pin 9.Be5!
halfpin-unpin 9...Kc1
10.Rc3+
Kd2
11.Nc4++-
) ; 8.Rd3?
Re2!
-pin (8...Ka2?
9.Ra3+
Kb1
10.Kd5
main line) ] 8...Rd2+!!
9.Kc4!!
[9.Kc5?
Rh2!
10.Kc4
(10.Rc3
Ka1
11.Ra3+
Kb1
12.Rd3
Ka1=
) 10...Rh4+
11.Kc3
Kc1
12.Rb3
Rxb4=
(12...b1N+
13.Kd3
Rh2
14.Be1+-
; 12...b1Q
13.Ba3++-
) ; 9.Bxd2?
model stalemate] 9...Rc2+
10.Nxc2
[10.Kd3?
Rd2+
11.Kc4
Rc2+
loss of time] 10...Kxc2
11.Ra2
-pin 11...Kc1
12.Ba3
-pin and win.