MESON Chess Problem Database

Problem Display
PID: 166702 (4k3/5N2/3p1Q2/1Kb5/8/8/6R1/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2016

4k3/5N2/3p1Q2/1Kb5/8/8/6R1/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Sxd6#
  • Tries
    • 1.Kc6?
      • threat
        • 2.Rg8#
      • 1...Kf8
        • 2.Sxd6#
      • 1...d5!
    • 1.Sxd6+?
      • 1...Kd7
        • 2.Rg7#
      • 1...Bxd6!
    • 1.Re2+?
      • 1...Kd7
        • 2.Qd8#
      • 1...Kf8
        • 2.Sh6#
      • 1...Be3!
  • Keys
    • 1.Rg7!
      • threat
        • 2.Qd8#
      • 1...Kd7
        • 2.Sxd6#
      • 1...Kf8
        • 2.Sxd6#
      • 1...Bb6
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR(C)+S(D),XP(b)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • R(A)
      • Vars
        • K(c);P-FLIGHT::QAR(C)+S(D),XP(b)
      • Refutation
        • P(b);
    • Try
      • S(D);CHECK,XP(b)
      • Vars
        • K(c);S_FLIGHT::R(A)
      • Refutation
        • B(a);XS(D)
    • Try
      • R(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(C)
        • K(c);P-FLIGHT::QAR(C)+S(D)
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • R(A);
    • Threat
      • QAR1(C)
    • Vars
      • K(c);S_FLIGHT::R(A)+S(D),XP(b)
      • K(c);P-FLIGHT::QAR(C)+S(D),XP(b)
      • B(a);N_GUARD::S(D),XP(b)
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