MESON Chess Problem Database

Problem Display
PID: 272708 (1N3B2/8/6Q1/pNrb1R2/p1k5/K2p4/1P4P1/8 w - - 0 1)

Gray, Henry

Liverpool Weekly Mercury, 1901

(First published on Sat Jan 5 1901)

1N3B2/8/6Q1/pNrb1R2/p1k5/K2p4/1P4P1/8

#2

8 + 6

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kxb5
      • 2.Qa6#
    • 1...Bxg2
      • 2.Rxc5#
    • 1...Bf3
      • 2.Rxc5#
    • 1...Be4
      • 2.Rxc5#
    • 1...Bc6
      • 2.Rxc5#
    • 1...Be6
      • 2.Rxc5#
    • 1...Bb7
      • 2.Rxc5#
    • 1...Bf7
      • 2.Rxc5#
    • 1...Ba8
      • 2.Rxc5#
    • 1...Bg8
      • 2.Rxc5#
  • Tries
    • 1.Rf4+?
      • 1...Kxb5
        • 2.Qa6#
      • 1...Be4!
    • 1.Qg4+?
      • 1...Be4
        • 2.Rxc5#
      • 1...Kxb5!
    • 1.b3+?
      • 1...Kxb5
        • 2.Qa6#
      • 1...axb3!
  • Keys
    • 1.Qe6!
      • 1...Kxb5
        • 2.Qa6#
      • 1...Rxb5
        • 2.Rf4#
      • 1...Bxe6
        • 2.Rxc5#
      • 1...d2
        • 2.Qe2#
      • 1...Rc6
        • 2.Qxd5#
      • 1...Rc7
        • 2.Qxd5#
      • 1...Rc8
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • K(c);OGATEB,S_FLIGHT,XS(D)::QAB1(F)
    • B(f);OGATE,XP(B)::R1(E),XR(e)
    • B(f);OGATE::R1(E),XR(e)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(c);S_CUTB(f),S_FLIGHT,XS(D)::QAB1(F)
      • Refutation
        • B(f);P_SPINB(f)
    • Try
      • Q(F);CHECK
      • Vars
        • B(f);OGATE,P_SPINB(f)::R1(E),XR(e)
      • Refutation
        • K(c);S_FLIGHT,XS(D)
    • Try
      • P(A);CHECK
      • Vars
        • K(c);S_CUTP(b),S_FLIGHT,XS(D)::QAB1(F)
      • Refutation
        • P(b);XP(A)
  • Actual
    • Q(F);P_PINB(f)
    • Vars
      • K(c);N_SPINB(f),OGATEB,S_FLIGHT,XS(D)::QAB1(F)
      • R(e);SBLOCK,XS(D)::R(E)
      • B(f);N_SPINB(f),OGATE,XQ(F)::R1(E),XR(e)
      • P(a);OGATEB::QAB(F)
      • R(e);N_GUARD::QAB1(F),XB(f)
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