MESON Chess Problem Database

Problem Display
PID: 18573 (2K1Qn1r/5P1k/3R2R1/6p1/4B1p1/8/8/8 w - - 0 1)

Mansfield, Comins

The Problemist, 1956

2K1Qn1r/5P1k/3R2R1/6p1/4B1p1/8/8/8

#2

6 + 5

5395 Schach fur Nussknacker 1994
3310 2345 Chess Problems 1997
3550 Complete Mansfield/II 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rg8
      • 2.fxg8Q#
    • 1...Sd7
      • 2.Rxg5#
      • 2.Rg8#
  • Tries
    • 1.Rd8?
      • 1...Sxg6
        • 2.Qxh8#
      • 1...Rg8
        • 2.fxg8Q#
      • 1...Se6
        • 2.Qxh8#
      • 1...Sd7
        • 2.Qxh8#
      • 1...g3!
    • 1.Qe7?
      • 1...Se6+
        • 2.f8S#
      • 1...Sxg6+
        • 2.f8Q#
      • 1...Sd7+
        • 2.Rg8#
        • 2.f8Q#
        • 2.f8S#
        • 2.f8B#
        • 2.f8R#
      • 1...Rg8
        • 2.fxg8Q#
        • 2.fxg8R#
      • 1...g3!
    • 1.Qxf8?
      • threat
        • 2.Rxg5#
        • 2.Rge6#
        • 2.Rgf6#
        • 2.Rh6#
        • 2.Rg7#
        • 2.Rg8#
      • 1...Rg8
        • 2.Rh6#
        • 2.Rxg8#
        • 2.Qxg8#
        • 2.fxg8Q#
      • 1...Rxf8+!
  • Keys
    • 1.Qd7!
      • 1...Se6+
        • 2.f8S#
      • 1...Sxg6+
        • 2.f8Q#
      • 1...Sxd7+
        • 2.Rg8#
      • 1...Rg8
        • 2.fxg8Q#
      • 1...g3
        • 2.Qh3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(e);OGATE::PXR(e)=Q
  • Tries
    • Try
      • R(B);
      • Vars
        • S(d);OGATE,P_SPINS(d),XR(C)::QAR1(F),XR(e)
        • R(e);OGATE::PXR(e)=Q
        • S(d);OGATE::QAR1(F),XR(e)
      • Refutation
        • P(a);
    • Try
      • Q(F);
      • Vars
        • S(d);CHECK,OGATE::P=S
        • S(d);CHECK,OGATE,P_SPINS(d),XR(C)::P=Q
        • R(e);OGATE::PXR(e)=Q
      • Refutation
        • P(a);
    • Try
      • Q(F);P_SPINQ(F),XS(d)
      • Threat
        • DUALS(6)
      • Refutation
        • R(e);CHECK,XQ(F)
  • Actual
    • Q(F);
    • Vars
      • S(d);CHECK,OGATE::P=S
      • S(d);CHECK,OGATE,P_SPINS(d),XR(C)::P=Q
      • S(d);CHECK,N_GUARD,XQ(F)::B(A)+R(C)
      • R(e);OGATE::PXR(e)=Q
      • P(a);OGATE::QAR(F)
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