MESON Chess Problem Database

Problem Display
PID: 185085 (8/4pqnr/4N3/4pk1p/2B4Q/7K/8/8 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1930

(First published on Sun May 4 1930)

8/4pqnr/4N3/4pk1p/2B4Q/7K/8/8

#2

4 + 7

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kg6
      • 2.Qg5#
    • 1...e4
      • 2.Qg5#
  • Tries
    • 1.Qf2+?
      • 1...Ke4
        • 2.Sc5#
        • 2.Sg5#
      • 1...Kg6!
    • 1.Qf4+?
      • 1...Kg6
        • 2.Qg5#
      • 1...exf4!
    • 1.Qg4+?
      • 1...Kf6
        • 2.Qg5#
      • 1...hxg4+!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Qg5#
      • 1...Kg6
        • 2.Qg5#
      • 1...Qxe6
        • 2.Be4#
      • 1...Sxe6
        • 2.Be4#
      • 1...Qg6
        • 2.Qf2#
      • 1...Qf6
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(b);S_FLIGHT::QAR1(C)
    • P(a);SBLOCK::QAR1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR1(C)
      • Refutation
        • P(a);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB1(C)
      • Refutation
        • P(c);CHECK,XQ(C)
  • Actual
    • B(B);
    • Threat
      • QAR1(C)
    • Vars
      • K(b);S_FLIGHT::QAR1(C)
      • Q(e);SBLOCK,XS(D)::B(B)
      • S(f);SBLOCK,XS(D)::B(B)
      • Q(e);SBLOCK::QAR(C)
      • Q(e);SBLOCK::QAB1(C)
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