MESON Chess Problem Database

Problem Display
PID: 234733 (4k3/8/n5Kb/5B2/7Q/1R6/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2013

4k3/8/n5Kb/5B2/7Q/1R6/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Qd8#
    • 1...Sc5
      • 2.Rb8#
    • 1...Sc7
      • 2.Rb8#
    • 1...Sb8
      • 2.Rxb8#
  • Tries
    • 1.Bd7+?
      • 1...Kf8
        • 2.Qd8#
      • 1...Kxd7!
    • 1.Rd3?
      • threat
        • 2.Rd8#
        • 2.Qd8#
      • 1...Kf8
        • 2.Rd8#
        • 2.Qd8#
      • 1...Bg5!
    • 1.Re3+?
      • 1...Kf8
        • 2.Qd8#
      • 1...Bxe3!
  • Keys
    • 1.Rb7!
      • threat
        • 2.Qe7#
      • 1...Kf8
        • 2.Qd8#
      • 1...Bg5
        • 2.Qh8#
      • 1...Bf8
        • 2.Bd7#
      • 1...Sc7
        • 2.Rb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(c);P-FLIGHT::QAR2(B)
    • S(a);N_GUARD::R(A)
    • S(a);N_GUARD::R(A),XS(a)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT,XB(C)
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Refutation
        • B(b);
    • Try
      • R(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR2(B)
      • Refutation
        • B(b);XR(A)
  • Actual
    • R(A);
    • Threat
      • QAR1(B)
    • Vars
      • K(c);P-FLIGHT::QAR2(B)
      • B(b);OGATE::QAR(B)
      • B(b);SBLOCK::B(C)
      • S(a);N_GUARD::R(A)
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