MESON Chess Problem Database

Problem Display
PID: 166011 (k7/2bN4/2Rr4/1KQ5/8/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2015

k7/2bN4/2Rr4/1KQ5/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Rxc7?
      • threat
        • 2.Ra7#
        • 2.Qa7#
      • 1...Rxd7
        • 2.Qa7#
      • 1...Rd5
        • 2.Ra7#
        • 2.Qxd5#
      • 1...Ra6
        • 2.Qf8#
      • 1...Rb6+!
    • 1.Qa3+?
      • 1...Kb7
        • 2.Qa6#
      • 1...Ba5!
  • Keys
    • 1.Ka6!
      • threat
        • 2.Qa7#
      • 1...Rxc6+
        • 2.Qxc6#
      • 1...Bb6
        • 2.Rc8#
      • 1...Bb8
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);XB(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XS(D)::QAR1(B)
        • R(a);OGATE::QAR(B)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • B(b);P_SPINB(b)
  • Actual
    • K(A);P_SPINR(C),S_FLIGHT
    • Threat
      • QAR1(B)
    • Vars
      • R(a);CHECK,OGATE,XR(C)::QAB(B),XR(a)
      • B(b);N_PINR(C)::R(C)
      • B(b);N_GUARD,SBLOCK::S(D)
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