MESON Chess Problem Database

Problem Display
PID: 81557 (6B1/2p5/1n1k1BK1/1Q6/8/8/8/8 w - - 0 1)

Allison, Christopher John

The Field, 1952

(First published on Sat Feb 16 1952)

6B1/2p5/1n1k1BK1/1Q6/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Sa4
      • 2.Qd5#
    • 1...Sc4
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sd7
      • 2.Qd5#
    • 1...Sa8
      • 2.Qd5#
    • 1...Sc8
      • 2.Qd5#
  • Tries
    • 1.Bd5?
      • threat
        • 2.Qc6#
      • 1...c6
        • 2.Qxc6#
      • 1...Sxd5!
    • 1.Qe5+?
      • 1...Kd7
        • 2.Qe6#
      • 1...Kc6!
  • Keys
    • 1.Be6!
      • 1...Kxe6
        • 2.Qc6#
      • 1...c5
        • 2.Qxb6#
      • 1...c6
        • 2.Qe5#
      • 1...Sa4
        • 2.Qd5#
      • 1...Sc4
        • 2.Qd5#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sd7
        • 2.Qd5#
      • 1...Sa8
        • 2.Qd5#
      • 1...Sc8
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
    • S(a);N_GUARD,SBLOCK::QAR1(A)
  • Tries
    • Try
      • B(D);
      • Threat
        • QAR1(A)
      • Vars
        • P(c);::QAR1(A),XP(c)
      • Refutation
        • S(a);XB(D)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(D);
    • Vars
      • K(b);P-FLIGHT,XB(D)::QAR2(A)
      • P(c);N_GUARD::QAR2(A),XS(a)
      • P(c);SBLOCK::QAB1(A)
      • S(a);N_GUARD::QAR1(A)
      • S(a);N_GUARD::QAR1(A),XS(a)
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