MESON Chess Problem Database

Problem Display
PID: 194521 (2n1r3/1N1bk1B1/r7/1p1R1R1B/1n6/1p2N2K/8/b3Q3 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1940

(First published on Sun Dec 1 1940)

2n1r3/1N1bk1B1/r7/1p1R1R1B/1n6/1p2N2K/8/b3Q3

#2

8 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Rf7#
    • 1...Bxf5+
      • 2.Sxf5#
    • 1...Sxd5
      • 2.Sxd5#
  • Tries
    • 1.Sg4+?
      • 1...Re6
        • 2.Rf7#
      • 1...Be6
        • 2.Rf7#
      • 1...Be5!
    • 1.Bf8+?
      • 1...Ke6
        • 2.Sc5#
        • 2.Bf7#
      • 1...Rxf8!
    • 1.Rxd7+?
      • 1...Ke6
        • 2.Sc5#
      • 1...Kxd7!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Sd5#
      • 1...Bxf5+
        • 2.Sxf5#
      • 1...Ke6
        • 2.Re5#
      • 1...Re6
        • 2.Rf7#
      • 1...Bc6
        • 2.Re5#
      • 1...Be6
        • 2.Qh4#
      • 1...Sd5
        • 2.Sxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(e);N_PINR(E),SBLOCK::R1(E)
    • B(f);CHECK,XR(E)::QAR(A)+S(B),DCHECK,XB(f)
    • S(c);XR(D)::QAR(A)+S(B),DCHECK,XS(c)
  • Tries
    • Try
      • S(B);CHECK,N_SPINR(E)
      • Vars
        • R(e);P_SPINR(e)::R1(E)
        • B(f);P_SPINB(f)::R1(E)
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • B(H);CHECK
      • Refutation
        • R(i);XB(H)
    • Try
      • R(D);CHECK,N_SPINR(E),XB(f)
      • Vars
        • K(g);P-FLIGHT::S(G)
      • Refutation
        • K(g);P-FLIGHT,XR(D)
  • Actual
    • R(D);
    • Threat
      • QAR(A)+S(B),DCHECK
    • Vars
      • B(f);CHECK,XR(E)::QAR(A)+S(B),DCHECK,XB(f)
      • K(g);N_PINR(E),P-FLIGHT::R1(E)
      • R(e);N_PINR(E),SBLOCK::R1(E)
      • B(f);N_PINR(E)::R(E)
      • B(f);SBLOCK,S_CUTR(e)::QAB(A)
      • S(c);::QAR(A)+S(B),DCHECK,XS(c)
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