MESON Chess Problem Database

Problem Display
PID: 188613 (2K1B1Q1/8/1B6/2nP1N1p/Npk3bR/1n5R/1PP5/3r4 w - - 0 1)

Rains, Cyril George

The Observer, 1937

(First published on Sun Dec 19 1937)

2K1B1Q1/8/1B6/2nP1N1p/Npk3bR/1n5R/1PP5/3r4

#2

11 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.d6#
    • 1...Sxa4
      • 2.cxb3#
    • 1...Se4
      • 2.cxb3#
    • 1...Sa6
      • 2.cxb3#
    • 1...Se6
      • 2.Se3#
    • 1...Sb7
      • 2.cxb3#
    • 1...Sd7
      • 2.Sd6#
  • Tries
    • 1.Rxg4+?
      • 1...Rd4
        • 2.Se3#
        • 2.Sd6#
      • 1...Sd4
        • 2.Se3#
        • 2.Sd6#
      • 1...Se4
        • 2.Se3#
        • 2.Sd6#
        • 2.cxb3#
      • 1...hxg4!
    • 1.d6+?
      • 1...Se6
        • 2.Se3#
      • 1...Rd5!
  • Keys
    • 1.Ba7!
      • threat
        • 2.Sb6#
      • 1...Sxa4
        • 2.cxb3#
      • 1...Se6
        • 2.Se3#
      • 1...Sd7
        • 2.Sd6#
      • 1...Sd3
        • 2.d6#
      • 1...Se4
        • 2.cxb3#
      • 1...Sa6
        • 2.cxb3#
      • 1...Sb7
        • 2.cxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD,S_CUTR(a)::QAB(K)+P(F)
    • S(f);N_GUARD,XS(D)::P(B),XS(b)
    • S(f);N_GUARD,N_SPINB(e)::P(B),XS(b)
    • S(f);N_GUARD::P(B),XS(b)
    • S(f);N_PINS(G)::S(G)
  • Tries
    • Try
      • R(E);CHECK,N_SPINS(G),XB(e)
      • Refutation
        • P(g);XR(E)
    • Try
      • P(F);CHECK
      • Vars
        • S(f);N_PINS(G),P_SPINS(f)::S(G)
      • Refutation
        • R(a);P_SPINR(a)
  • Actual
    • B(H);
    • Threat
      • S(D)
    • Vars
      • S(f);N_GUARD,XS(D)::P(B),XS(b)
      • S(f);N_PINS(G)::S(G)
      • S(f);N_GUARD,S_CUTR(a)::QAB(K)+P(F)
      • S(f);N_GUARD,N_SPINB(e)::P(B),XS(b)
      • S(f);N_GUARD::P(B),XS(b)
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