MESON Chess Problem Database

Problem Display
PID: 65350 (4K3/3Q4/2B1P3/3PrPR1/4k3/1R2Pp2/8/8 w - - 0 1)

Subotic, Miroslav

Comm., The Problemist, 2006

4K3/3Q4/2B1P3/3PrPR1/4k3/1R2Pp2/8/8

#2

9 + 3

56 The Problemist 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qxd5#
    • 1...Rxe6+
      • 2.Qxe6#
  • Tries
    • 1.Qg7?
      • 1...Rxe6+
        • 2.dxe6#
      • 1...Rxd5
        • 2.Qd4#
      • 1...Rxf5
        • 2.Qd4#
      • 1...f2!
    • 1.e7?
      • threat
        • 2.Rg4#
      • 1...Rxe7+
        • 2.Qxe7#
      • 1...Rxd5
        • 2.Qe6#
        • 2.Qxd5#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Re6
        • 2.Qxe6#
      • 1...f2!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Rg4#
        • 2.Qh4#
      • 1...Rxe6+
        • 2.fxe6#
      • 1...Rxd5
        • 2.f6#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...f2
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(c);N_PINP(G),OGATE,P_SPINR(c),XP(C)::QAB1(H),XR(c)
    • R(c);CHECK,OGATE,XP(G)::QAR2(H),XR(c)
  • Tries
    • Try
      • Q(H);
      • Vars
        • R(c);CHECK,OGATE,XP(G)::B(F)+P(C),XR(c)
        • R(c);N_PINP(G),OGATE,P_SPINR(c),XP(C)::QAR1(H)
        • R(c);N_PINP(G),OGATE,XP(D)::QAR1(H)
      • Refutation
        • P(a);
    • Try
      • P(G);
      • Threat
        • R(E)
      • Vars
        • R(c);CHECK,OGATE,XP(G)::QAR(H),XR(c)
        • R(c);N_PINP(G),OGATE,XP(D)::QAB1(H),XR(c)
        • R(c);OGATEB::QAR2(H),XR(c)
      • Refutation
        • P(a);
  • Actual
    • Q(H);
    • Threat
      • DUALS(2)
    • Vars
      • R(c);CHECK,OGATE,XP(G)::QAB(H)+P(D),XR(c)
      • R(c);N_GUARD,N_PINP(G),P_SPINR(c),XP(C)::QAB(H)+P(D)
      • R(c);N_PINP(G),OGATE,P_SPINR(c),XP(D)::QAB1(H),XR(c)
      • P(a);OGATEB::QAB(H)
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