MESON Chess Problem Database

Problem Display
PID: 153200 (k5r1/2P1RQ2/8/8/6p1/8/8/3K4 w - - 0 1)

Lincoln, Robert A

StrateGems, 2011

k5r1/2P1RQ2/8/8/6p1/8/8/3K4

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rg5
      • 2.c8Q#
      • 2.c8R#
    • 1...Rg6
      • 2.c8Q#
      • 2.c8R#
    • 1...Rg7
      • 2.c8Q#
      • 2.c8R#
    • 1...Rd8+
      • 2.cxd8Q#
      • 2.cxd8R#
  • Tries
    • 1.Qg6?
      • threat
        • 2.Qa6#
      • 1...Rd8+
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Ka7
        • 2.c8Q#
        • 2.c8R#
      • 1...Rxg6
        • 2.c8Q#
        • 2.c8R#
      • 1...Kb7!
    • 1.Qf6?
      • threat
        • 2.Qa6#
      • 1...Rd8+
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Ka7
        • 2.c8Q#
        • 2.c8R#
      • 1...Rg6
        • 2.c8Q#
        • 2.c8R#
      • 1...Kb7!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qa6#
      • 1...Rd8+
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Ka7
        • 2.c8Q#
        • 2.c8R#
      • 1...Kb7
        • 2.c8Q#
        • 2.c8R#
      • 1...Rg6
        • 2.c8Q#
        • 2.c8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::P=Q
    • R(c);CHECK,OGATE::PXR(c)=Q
  • Tries
    • Try
      • Q(D);
      • Threat
        • QAR2(D)
      • Vars
        • R(c);CHECK,OGATE::PXR(c)=Q
        • K(b);P-FLIGHT::P=Q
        • R(c);N_GUARD,XQ(D)::P=Q
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(D);
      • Threat
        • QAR2(D)
      • Vars
        • R(c);CHECK,OGATE::PXR(c)=Q
        • K(b);P-FLIGHT::P=Q
        • R(c);N_GUARD::P=Q
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(D);
    • Threat
      • QAR2(D)
    • Vars
      • R(c);CHECK,OGATE::PXR(c)=Q
      • K(b);P-FLIGHT::P=Q
      • K(b);S_FLIGHT::P=Q
      • R(c);N_GUARD::P=Q
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