py_20131022
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#2 sentinels 1 pawn with Pao
: every move (except pawn move) let a pawn on departure square first and last row are not concerned : chinese Rook needing a hurdle to captureMichel CAILLAUD
white Pa2 Kd6 Ra4 WPg7a6 Sg3
black Pc2 Kg5 Bb1
#2(6+3)a) Sentinels 1 pawnb) opponent's pawn Sentinels 1 pawn
🨵g7, a6: Pao
{}
a)
1.Ra4-g4 + ?
but
1...Kg5*g4 !{}
1.Ra4-c4 ! zugzwang.
1...Bb1*a2
2.WPg7-g8[+wPg7] #
1...c2-c1=Q {or}
1...c2-c1=S {or}
1...c2-c1=R {or}
1...c2-c1=B {or}
1...c2-c1=BP
2.Rc4-g4 #{}
b) {opponent's pawn Sentinels 1 pawn}
1.Ra4-g4 + ?
but
1...Kg5*g4 !{}
1.Ra4-e4 ! zugzwang.
1...Bb1*a2
2.Re4-g4 #{}
1...c2-c1=Q {or}
1...c2-c1=S {or}
1...c2-c1=R {or}
1...c2-c1=B {or}
1...c2-c1=BP
2.WPg7-g8[+bPg7] #
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