MESON Chess Problem Database

Problem Display
PID: 249297 (r1k1rb2/p1P1p1p1/p3N1P1/KR6/2Q5/8/8/8 w - - 0 1)

Lipton, Michael

The Problemist, 1990

r1k1rb2/p1P1p1p1/p3N1P1/KR6/2Q5/8/8/8

#2

6 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rb8
      • 2.cxb8S#
    • 1...Rd8
      • 2.cxd8Q#
      • 2.cxd8R#
  • Tries
    • 1.Kxa6?
      • 1...Rb8
        • 2.cxb8S#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kd7!
    • 1.Rb1?
      • 1...Rb8
        • 2.cxb8S#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kd7!
    • 1.Rb2?
      • 1...Rb8
        • 2.cxb8S#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kd7!
    • 1.Rb3?
      • 1...Rb8
        • 2.cxb8S#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kd7!
    • 1.Rb4?
      • 1...Rb8
        • 2.cxb8S#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kd7!
    • 1.Rd5?
      • threat
        • 2.Qxa6#
      • 1...Kb7
        • 2.Qxa6#
      • 1...Rb8!
    • 1.Rb8+?
      • 1...Kd7
        • 2.Qd5#
      • 1...Rxb8!
    • 1.Qd3?
      • 1...Rb8
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.Qxd8#
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...axb5!
    • 1.Qd5?
      • 1...Rb8
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.Qxd8#
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...axb5!
    • 1.Qd4?
      • 1...Rb8
        • 2.Rxb8#
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.Qxd8#
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...axb5!
    • 1.Qc6?
      • threat
        • 2.Qxe8#
      • 1...Rd8
        • 2.cxd8Q#
        • 2.cxd8S#
        • 2.cxd8B#
        • 2.cxd8R#
      • 1...axb5!
  • Keys
    • 1.Rb7!
      • 1...Kxb7
        • 2.Qxa6#
      • 1...Kd7
        • 2.c8S#
      • 1...Rb8
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Rd8
        • 2.cxd8S#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(e);OGATE::PXR(e)=S
    • R(g);OGATE::PXR(g)=Q
  • Tries
    • Try
      • K(B);P-FLIGHT,XP(a)
      • Vars
        • R(e);OGATE::PXR(e)=S
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • R(e);OGATE::PXR(e)=S
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • R(e);OGATE::PXR(e)=S
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • R(e);OGATE::PXR(e)=S
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(C);
      • Vars
        • R(e);OGATE::PXR(e)=S
        • R(g);OGATE::PXR(g)=Q
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(C);
      • Threat
        • QAB(A),XP(a)
      • Vars
        • K(f);S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • R(e);
    • Try
      • R(C);CHECK
      • Vars
        • K(f);S_FLIGHT::QAR2(A)
      • Refutation
        • R(e);XR(C)
    • Try
      • Q(A);
      • Refutation
        • P(a);XR(C)
    • Try
      • Q(A);
      • Refutation
        • P(a);XR(C)
    • Try
      • Q(A);
      • Refutation
        • P(a);XR(C)
    • Try
      • Q(A);
      • Threat
        • QAR2(A),XR(g)
      • Refutation
        • P(a);XR(C)
  • Actual
    • R(C);
    • Vars
      • K(f);OGATEB,S_FLIGHT,XR(C)::QAB1(A),XP(a)
      • K(f);OGATE,S_FLIGHT::P=S
      • R(e);OGATE::PXR(e)=Q
      • R(g);OGATE::PXR(g)=S
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