MESON Chess Problem Database

Problem Display
PID: 270680 (6r1/b7/8/3QNkPr/5B1p/4PR1P/8/1b4K1 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1959

(First published on Sun May 17 1959)

6r1/b7/8/3QNkPr/5B1p/4PR1P/8/1b4K1

#2

8 + 6

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rhxg5+
      • 2.Bg3#
    • 1...Rgxg5+
      • 2.Bg3#
    • 1...Rg6
      • 2.Sd3#
      • 2.Sc4#
      • 2.Sg4#
      • 2.Sc6#
      • 2.Sd7#
      • 2.Sf7#
    • 1...Be4
      • 2.Qf7#
      • 2.Qd7#
    • 1...Bxe3+
      • 2.Bxe3#
  • Tries
    • 1.Qd3+?
      • 1...Ke6
        • 2.Qd7#
      • 1...Bxd3!
  • Keys
    • 1.g6!
      • threat
        • 2.Bh6#
      • 1...Rg5+
        • 2.Bg3#
      • 1...Rxg6+
        • 2.Sg4#
      • 1...Bxe3+
        • 2.Bxe3#
      • 1...Kf6
        • 2.Qf7#
      • 1...Rh6
        • 2.Bxh6#
      • 1...Be4
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(d);CHECK,SBLOCK,XP(H)::R(C)+B(E)
    • R(f);CHECK,SBLOCK,XP(H)::R(C)+B(E)
    • B(e);CHECK,OGATE,P_PINP(H),XP(B)::R(C)+B(E),XB(e)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);N_GUARD,S_FLIGHT::QAB1(F)
      • Refutation
        • B(a);XQ(F)
  • Actual
    • P(H);
    • Threat
      • R(C)+B(E)
    • Vars
      • R(d);CHECK,SBLOCK::R(C)+B(E)
      • R(f);CHECK,SBLOCK,XP(H)::QAR(F)+S(G)
      • B(e);CHECK,OGATE,P_PINP(H),XP(B)::R(C)+B(E),XB(e)
      • K(c);N_GUARD,P-FLIGHT::QAR1(F)
      • R(d);::R(C)+B(E),XR(d)
      • B(a);SBLOCK::QAR2(F)
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