MESON Chess Problem Database

Problem Display
PID: 65210 (2k5/2P5/n1K1p3/8/1b3Q2/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2006

2k5/2P5/n1K1p3/8/1b3Q2/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Be1
      • 2.Qf8#
    • 1...Bd2
      • 2.Qf8#
    • 1...Bc3
      • 2.Qf8#
    • 1...Ba5
      • 2.Qf8#
    • 1...Bf8
      • 2.Qxf8#
    • 1...Sc5
      • 2.Qf8#
    • 1...Sxc7
      • 2.Qxc7#
    • 1...Sb8+
      • 2.cxb8Q#
      • 2.cxb8R#
    • 1...e5
      • 2.Qg4#
      • 2.Qf5#
  • Tries
    • 1.Qd6?
      • threat
        • 2.Qxe6#
        • 2.Qd7#
        • 2.Qd8#
      • 1...Sb8+
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sxc7
        • 2.Qxc7#
      • 1...Sc5
        • 2.Qf8#
        • 2.Qd8#
      • 1...e5
        • 2.Qe6#
        • 2.Qd7#
        • 2.Qd8#
      • 1...Bxd6!
    • 1.Qf7?
      • threat
        • 2.Qxe6#
        • 2.Qe8#
        • 2.Qd7#
      • 1...Sxc7
        • 2.Qxc7#
      • 1...Be7
        • 2.Qxe6#
      • 1...Sc5
        • 2.Qe8#
        • 2.Qg8#
        • 2.Qf8#
      • 1...e5
        • 2.Qe6#
        • 2.Qe8#
        • 2.Qf5#
        • 2.Qd7#
      • 1...Sb8+!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qxe6#
      • 1...Sb8+
        • 2.cxb8Q#
        • 2.cxb8R#
      • 1...Sxc7
        • 2.Qxc7#
      • 1...Sc5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • B(a);N_GUARD::QAR(A)
    • B(a);N_GUARD::QAR(A),XB(a)
    • S(b);S_CUTB(a)::QAR(A)
    • S(b);OGATE,XP(C)::QAR1(A),XS(b)
    • S(b);CHECK,OGATE::PXS(b)=Q
  • Tries
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);CHECK,OGATE::PXS(b)=Q
        • S(b);OGATE,XP(C)::QAR1(A),XS(b)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);OGATE,XP(C)::QAR1(A),XS(b)
        • B(a);::QAB(A),XP(c)
      • Refutation
        • S(b);CHECK
  • Actual
    • Q(A);
    • Threat
      • QAB(A),XP(c)
    • Vars
      • S(b);CHECK,OGATE::PXS(b)=Q
      • S(b);OGATE,XP(C)::QAR1(A),XS(b)
      • S(b);S_CUTB(a)::QAR(A)
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