MESON Chess Problem Database

Problem Display
PID: 240296 (4R3/2P2kBr/7p/4K2b/5Pp1/6P1/4RQ2/1B6 w - - 0 1)

Lincoln, Robert A

Problem-Forum, 2010

4R3/2P2kBr/7p/4K2b/5Pp1/6P1/4RQ2/1B6

#2

9 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Ba2+?
      • 1...Kxg7
        • 2.Rg8#
      • 1...Kxe8
        • 2.Kd6#
      • 1...Kg6!
    • 1.Qc5?
      • threat
        • 2.Qe7#
        • 2.Qf8#
      • 1...Kxg7
        • 2.Qf8#
      • 1...Rh8
        • 2.Qe7#
      • 1...Kxe8!
    • 1.Qb6?
      • 1...Kxg7
        • 2.Qf6#
      • 1...Kxe8
        • 2.Qe6#
      • 1...Rxg7
        • 2.Qe6#
      • 1...Bg6
        • 2.Qxg6#
      • 1...Rh8!
    • 1.Qa7?
      • threat
        • 2.c8Q#
        • 2.c8R#
      • 1...Kxe8
        • 2.c8Q#
        • 2.c8R#
      • 1...Rxg7
        • 2.c8Q#
        • 2.c8R#
      • 1...Rh8
        • 2.c8Q#
        • 2.c8R#
      • 1...Bg6
        • 2.c8Q#
        • 2.c8R#
      • 1...Kxg7!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qd7#
      • 1...Kxg7
        • 2.Ke6#
      • 1...Kxe8
        • 2.Kf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(d);P-FLIGHT,XB(H)::R1(I)
        • K(d);S_FLIGHT,XR(I)::R(B)+K(F)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT,XB(H)::QAB1(C)
        • R(e);::QAR1(C)
      • Refutation
        • K(d);S_FLIGHT,XR(I)
    • Try
      • Q(C);
      • Vars
        • K(d);P-FLIGHT,XB(H)::QAB1(C)
        • K(d);S_FLIGHT,XR(I)::QAR2(C)
        • R(e);SBLOCK,XB(H)::QAB1(C)
        • B(b);N_GUARD::QAB1(C),XB(b)
      • Refutation
        • R(e);
    • Try
      • Q(C);
      • Threat
        • P=Q
      • Vars
        • K(d);S_FLIGHT,XR(I)::P=Q
        • R(e);SBLOCK,XB(H)::P=Q
        • R(e);::P=Q
        • B(b);::P=Q
      • Refutation
        • K(d);P-FLIGHT,XB(H)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(d);P-FLIGHT,XB(H)::QAB(C)+K(F)
      • K(d);S_FLIGHT,XR(I)::R(B)+K(F)
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