MESON Chess Problem Database

Problem Display
PID: 163597 (1N4Bn/4pq2/K7/3kB2R/1P1N4/3P4/3n4/8 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1925

(First published on Sun Sep 13 1925)

1N4Bn/4pq2/K7/3kB2R/1P1N4/3P4/3n4/8

#2

8 + 5

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qe6+
      • 2.Bxe6#
  • Tries
    • 1.Bxf7+?
      • 1...e6
        • 2.Bxe6#
      • 1...Sxf7!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sc7#
      • 1...Qe6+
        • 2.Bd6#
      • 1...Ke6
        • 2.Sc7#
      • 1...e6
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(d);CHECK,OGATE::B(H),XQ(d)
  • Tries
    • Try
      • B(H);CHECK,XQ(d)
      • Vars
        • P(c);P_SPINP(c)::B(H),XP(c)
      • Refutation
        • S(e);XB(H)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • Q(d);CHECK,S_CUTP(c)::R(E)+B(D)
      • K(b);S_FLIGHT::S(C)
      • P(c);N_SPINQ(d),SBLOCK::S(C)
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