MESON Chess Problem Database

Problem Display
PID: 203195 (b4K2/5Qn1/3pp3/4p2R/2P1k3/5Nb1/8/2B1Nr1B w - - 0 1)

Stuart Green, G

The Observer, 1951

(First published on Sun Sep 30 1951)

b4K2/5Qn1/3pp3/4p2R/2P1k3/5Nb1/8/2B1Nr1B

#2

8 + 8

5454 Near Snap 2020
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bh4
      • 2.Rxh4#
    • 1...Sxh5
      • 2.Qg6#
      • 2.Qh7#
    • 1...Se8
      • 2.Qg6#
      • 2.Qh7#
  • Tries
    • 1.Qb7+?
      • 1...d5
        • 2.Qb1#
      • 1...Bxb7!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qe3#
      • 1...Rxf3+
        • 2.Bxf3#
      • 1...Rxe1
        • 2.Sxe1#
      • 1...Sxh5
        • 2.Qh7#
      • 1...Bf2
        • 2.Sg1#
      • 1...Bf4
        • 2.Sd2#
      • 1...Sf5
        • 2.Sg5#

Anticipated by 54923(1926)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • B(b);N_GUARD::R(F),XB(b)
  • Tries
    • Try
      • Q(G);CHECK,P_SPINS(D)
      • Vars
        • P(e);P_SPINP(e)::QAB(G)
      • Refutation
        • B(h);XQ(G)
  • Actual
    • Q(G);P_SPINS(D)
    • Threat
      • QAR1(G)
    • Vars
      • R(a);CHECK,OGATE,P_SPINR(a),XS(D)::B(C),XR(a)
      • R(a);N_PINS(D),XS(B)::B(C)+S(D),XR(a)
      • S(g);OGATE,XR(F)::QAB(G)
      • B(b);N_PINS(D)::B(C)+S(D)
      • B(b);N_PINS(D),SBLOCK::B(C)+S(D),DCHECK
      • S(g);N_PINS(D),SBLOCK::B(C)+S(D),DCHECK
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