As is known KBBN against of KR wins without problems. However, here White have "indemnification" - three pawns. But, except one they are not protected and besides, the white king has not so good position. Also turn of a move of the black. It gives them the initiative. Black have two strongest continuations here 1...Sc7+ and 1...Kf6 . In the first variant we are quickly convinced - white have a draw faster
1...Kf6
[1...Sc7+
2.Kf7!
(2.Ke7?
Sxe6
3.Rh1
Bxf4-+
) 2...Bb3!
Pin 3.Kg8!!
Selfpin (3.g7?
Bxe6+
4.Kf8
Selfpin 4...Kf6-+
) 3...Sxe6
4.Kh7
Bg7
5.Rb1
Bc2
6.Rb7
Bf6
7.Kh6=
] 2.g7!
[try 2.e7?
Sd4!
3.Ra1!
Bd3!
(3...Bxg6+?
4.Kd7
Bf5+
5.Kd6
Bxf4+
6.Kd5
Se6
7.e8S+!!=
) 4.Ra5!
(4.Kd7
Bb5+-+
) 4...Sc6
5.g7
(5.Rd5
Bxg6+
6.Kd7
Sxe7
7.Rd6+
Kf7-+
) 5...Sxe7
6.Rd5
Bg6+-+
(6...Bc4?
7.Rd6+
Be6 Selfpin 8.f5!=
) ] 2...Bxg7
3.f5!
Bxf5
4.e7
Bh6
5.Rf1!
Pin [try 5.Kd8?
Be3
6.Rf1
Pin (6.e8S+
Kf7
7.Rg7+
Kf8-+
; 6.e8Q
Bb6#
) 6...Bb6+
7.Ke8
Sd4
8.Kf8
Bc5!-+
Pin] 5...Sd4
6.Rd1
Unpin 6...Se6
[Main B 6...Be3
7.Rf1
Pin 7...Bg5
(7...Bh6
8.Rd1 Unpin 8...Se6
9.Rf1=
Pin, draws as in Main B) 8.Kf8
Bh6+
9.Ke8
Bd2
10.Rd1
Unpin (10.Kf8?
Bb4!-+
Pin) 10...Bc3
11.Rc1
(11.Kf8?
Se6+-+
; 11.Rf1? Pin 11...Bb4-+
) 11...Ba5
12.Rc5
Bb6
(12...Bd2
13.Rd5
Be3
14.Rd6+
Be6 Selfpin 15.Kd8=
) 13.Rd5
Be6
(13...Ke6
14.Kf8!
Kxd5
15.e8Q=
) 14.Rd6
Pin 14...Bc5
15.Kd8!
Bxd6
16.e8Q=
(16.e8S+?
Ke5-+
) ] 7.Rf1!
Pin [try 7.Rd6?
Pin 7...Bc2
8.Ra6
Pin (8.Rc6
Pin 8...Ba4-+
Pin) 8...Bd3
9.Rb6
Pin (9.Rc6
Pin 9...Bb5-+
Pin) 9...Be3
10.Rc6
Pin 10...Bb5-+
Pin; 7.Rd5?
Bg4!
(7...Sc7+?
8.Kd8
Sxd5
9.e8Q
Bg5
10.Qh5!
(10.Qg8?
Be6
11.Qh7
Ke5+
12.Ke8
Sf6+-+
) 10...Be6
11.Ke8!=
) 8.Rd6
Pin 8...Ke5
9.Kd7
Sd4+!
10.Kc7
Sb5+-+
] 7...Bf4!
Selfunpin/Halfpin [7...Sf4
Selfunpin/Halfpin 8.Kd8!=
(8.Rf3!?
Bg5!
(8...Ke6?
9.Kd8
Kd6
10.e8S+=
) 9.Rxf4
Pin 9...Bxf4
10.Kd8
Be3
11.e8Q
Bb6#
) ] 8.Rf2!!
Halfpin 8...Bd3
Selfpin 9.Rb2!
Unpin 9...Bc1
10.Rf2+
Bf4
Selfpin 11.Rb2
npin/Positional draw, or 11...Be5
12.Rf2+
Bf4
Selfpin 13.Rb2
Unpin/Positional draw, or 13...Sg7+
[13...Sg5
14.Rb4=
e.g. 14...Bd6
15.Rb6!=
Pin] 14.Kd8
[14.Kf8?
Bd6!-+
Pin] 14...Bg6
15.Rb6+
[15.Rf2?
Pin 15...Kf5-+
Selfpin] 15...Kf5
16.Rxg6
draws. . All Black & White men get a pin in the play at least one times with the exception of the f4wP.
"All Black & White men get a pin in the play at least one times with the exception of the f4wP. . Task (Matous & Polasek also show a lot of pinned pieces); the author correctly claims that almost all pieces (n=6) that are present in the initial position (except wPf4 and the kings of course) are pinned. The first main line (1/\Sc7+) is not very interesting. Two correct pawn sacs, but the author forgets to explain (4...Sd4 5.Rd1!), BTM. Points awarded for the task, the study lacks artistic value." HvH
Note::You can compare this study with the study Matous & Polasek - No.11 (IA)