MESON Chess Problem Database

Problem Display
PID: 231775 (3b4/2p1r1R1/2P2kpP/2Q1q3/4P2P/2B1p1NK/4B3/8 w - - 0 1)

Mercer, WH

Pen & Pencil, 1889

(First published on Sat Jul 20 1889)

3b4/2p1r1R1/2P2kpP/2Q1q3/4P2P/2B1p1NK/4B3/8

#2

10 + 7

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qxe5#
    • 1...Re6
      • 2.Qf8#
    • 1...Rd7
      • 2.Qxe5#
    • 1...Rf7
      • 2.Qxe5#
  • Tries
    • 1.Sh5+?
      • 1...Ke6
        • 2.Qxe5#
      • 1...gxh5!
    • 1.Bxe5+?
      • 1...Ke6
        • 2.Bc4#
        • 2.Bg4#
        • 2.Qd5#
      • 1...Rxe5!
    • 1.Qd6+?
      • 1...Re6
        • 2.Bxe5#
        • 2.Qf8#
      • 1...cxd6!
  • Keys
    • 1.Bc4!
      • 1...Qxc3
        • 2.Qg5#
      • 1...Rxg7
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Qd4
        • 2.Qg5#
      • 1...Re6
        • 2.Qf8#
      • 1...Rd7
        • 2.Bxe5#
        • 2.Qxe5#
      • 1...Rf7
        • 2.Bxe5#
        • 2.Rxf7#
        • 2.Qxe5#
      • 1...Re8
        • 2.Rf7#
      • 1...e2
        • 2.Qf2#
      • 1...g5
        • 2.Sh5#
        • 2.hxg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(c);N_SPINQ(b),P-FLIGHT::QAR1(G),XQ(b)
    • R(f);OGATE,SBLOCK::QAR2(G)
    • R(f);N_GUARD::QAB1(G),XQ(b)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(c);N_SPINQ(b),P-FLIGHT::QAR1(G),XQ(b)
      • Refutation
        • P(d);XS(C)
    • Try
      • B(B);CHECK,XQ(b)
      • Refutation
        • R(f);XB(B)
    • Try
      • Q(G);CHECK
      • Refutation
        • P(e);XQ(G)
  • Actual
    • B(A);
    • Vars
      • Q(b);N_SPINQ(b),OGATE,XB(B)::QAB1(G)
      • Q(b);OGATE::QAB1(G)
      • R(f);OGATE::QAR2(G)
      • R(f);N_GUARD::R1(J)
      • P(a);OGATE::QAR(G)
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