MESON Chess Problem Database

Problem Display
PID: 145021 (4n1rq/2p2PkP/2KpR2b/3p2PP/3N4/8/8/B4R2 w - - 0 1)

Macleod, Norman Alasdair

3rd Prize, Problem Observer, 1989

4n1rq/2p2PkP/2KpR2b/3p2PP/3N4/8/8/B4R2

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.fxg8Q#
      • 2.fxg8R#
  • Tries
    • 1.Sf5+?
      • 1...Kxh7
        • 2.Rxh6#
      • 1...Kf8
        • 2.fxe8Q#
      • 1...Kxf7!
    • 1.gxh6+?
      • 1...Kf8
        • 2.Rxe8#
        • 2.fxe8Q#
        • 2.fxe8R#
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Kxh7!
    • 1.fxe8S+?
      • 1...Kxh7
        • 2.Rxh6#
      • 1...Rxe8!
    • 1.f8Q+?
      • 1...Kxh7
        • 2.Rxh6#
        • 2.Qxh6#
      • 1...Rxf8!
    • 1.f8B+?
      • 1...Kxh7
        • 2.Rxh6#
      • 1...Rxf8!
    • 1.hxg8R+?
      • 1...Kh7
        • 2.Rxh6#
        • 2.g6#
      • 1...Qxg8!
  • Keys
    • 1.Re7!
      • threat
        • 2.fxe8Q#
        • 2.fxe8S#
        • 2.fxe8B#
        • 2.fxe8R#
        • 2.fxg8Q#
        • 2.fxg8S#
        • 2.fxg8B#
        • 2.fxg8R#
        • 2.f8Q#
        • 2.f8S#
        • 2.f8B#
        • 2.f8R#
      • 1...Kxh7
        • 2.f8S#
      • 1...Kf8
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxh7
        • 2.Se6#
      • 1...Bxg5
        • 2.f8Q#
        • 2.f8B#
      • 1...Sf6
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...Rf8
        • 2.fxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(e);S_FLIGHT::PXR(g)=Q
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XP(I)::R1(G),XB(c)
        • K(e);S_FLIGHT::PXS(f)=Q
      • Refutation
        • K(e);P-FLIGHT,XP(H)
    • Try
      • P(D);CHECK,XB(c)
      • Refutation
        • K(e);P-FLIGHT,XP(I)
    • Try
      • P(H);CHECK,XS(f)
      • Vars
        • K(e);P-FLIGHT,XP(I)::R1(G),XB(c)
      • Refutation
        • R(g);XS(H)
    • Try
      • P(H);CHECK
      • Refutation
        • R(g);XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • K(e);P-FLIGHT,XP(I)::R1(G),XB(c)
      • Refutation
        • R(g);XB(H)
    • Try
      • P(I);CHECK,XR(g)
      • Refutation
        • Q(h);XR(I)
  • Actual
    • R(G);
    • Threat
      • DUALS(12)
    • Vars
      • K(e);P-FLIGHT,XP(I)::P=S
      • K(e);S_FLIGHT::PXS(f)=Q
      • Q(h);SBLOCK,XP(I)::B(A)+S(C),DCHECK
      • B(c);XP(D)::P=Q
      • S(f);::PXR(g)=Q
      • R(g);::PXS(f)=S
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