# No.1390 (CJF)

 No.1390 Chris Feather (Англия) Оригинальные сказочные задачи JF-2019/I: январь – июнь’2019

Определения: (показать/спрятать)

 No.1390 Chris Feather England original – 23.03.2019 Solutions: (click to show/hide) white Ke6 Bg6 Sg4 black Ke2 Ph2 ser-h#15        b) Bg6→e5         (3+2) AlphabeticChess Messigny Chess {for animation exchange of places is shown as capturing and appearance, like wSf2<->bSg4 as Sxg4 (+wSf2)} a) 1.Ke2-f3 2.Kf3-g3 3.Kg3-h4 4.h2-h1=S 5.Sh1-f2 6.Sf2*g4[+wSf2] {(Sf2<->Sg4) } 7.Sg4-e5 8.Se5-f7 9.Sf7-h8 10.Kh4-g5 11.Kg5-h6 12.Kh6*e6[+wKh6] {(Kh6<->Ke6) } 13.Ke6-f6 14.Kf6*h6[+wKf6] {(Kf6<->Kh6)} 15.Sh8-f7 Sf2-g4 # b) wBg6-->e5 1.Ke2*e6[+wKe2] {(Ke2<->Ke6)} 2.Ke6-f5 3.Kf5-g5 4.Kg5-h4 5.h2-h1=B 6.Bh1-e4 { } 7.Be4-h7 8.Kh4-h3 9.Kh3-g2 10.Kg2-h1 11.Kh1*e2[+wKh1] {(Kh1<->Ke2) } 12.Ke2-f1 13.Kf1*h1[+wKf1] {(Kf1<->Kh1)} 14.Bh7-e4 15.Be4-g2 + { } Be5*g2[+bBe5] # {(Be5<->Bg2) (C+ by Popeye 4.79)}

### 1 комментарий: No.1390 (CJF)

1. Geoff Foster пишет:

In each mate the wB/wS that does not give mate does guard duty instead.

In (a) there are switchbacks by both Knights (wSg4-f2-g4 and bSf7-h8-f7). The bK wants to move to h6, but that square is attacked by the wSg4. Therefore the bK first goes to h4, giving the move to the bPh2, which is then able to shift the wS by promoting to Knight with a subsequent swap of Knights. The bS must then move all the way to h8 to give the bK the move (but not 7.Sh6? because then the bK gets the move too early!). The move 15.Sf7 is necessary so that after White plays Sg4# the black King would still be in check after a Knight swap.

In (b) the bK also wants to move to h4, but not 1.Kf3? 2.Kg2 3.Kh3 4.Kh4, because then after 11.Kh1Ke6 the bKe6 is too far away from h1. Therefore play begins with a King swap, so that after 11.Kh1Ke2 the bK is on e2! In the mate the bK would still be in check after a King swap.

By the way, in the definition of Messigny Chess, the word “bit” should be “not”!