MESON Chess Problem Database

Problem Display
PID: 194309 (2B5/5nKp/pBbpP1P1/3k3r/p1NN1p2/3Q4/n7/b7 w - - 0 1)

Holroyd, GC

The Observer, 1940

(First published on Sun Mar 24 1940)

2B5/5nKp/pBbpP1P1/3k3r/p1NN1p2/3Q4/n7/b7

#2

8 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd4+
      • 2.Qxd4#
    • 1...Bb7
      • 2.Bxb7#
    • 1...Sc3
      • 2.Sc2#
      • 2.Se2#
      • 2.Sb3#
      • 2.Sf3#
      • 2.Sb5#
      • 2.Sf5#
  • Tries
    • 1.Se3+?
      • 1...Ke5
        • 2.Sxc6#
      • 1...fxe3!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Qe4#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Ke5
        • 2.Sxc6#
      • 1...Re5
        • 2.Qc4#
      • 1...Sc3
        • 2.S4f3#
      • 1...Sg5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(a);CHECK,OGATE,P_SPINB(a),XS(C)::QAR1(A),XB(a)
    • B(h);OGATEB::B(H),XB(h)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(e);N_PINS(C),P-FLIGHT::S(C),XB(h)
      • Refutation
        • P(d);XS(B)
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XS(C)::QAR1(A),XB(a)
      • K(e);N_PINS(C),P-FLIGHT::S(C),XB(h)
      • R(f);N_PINS(C),SBLOCK::QAB1(A)
      • S(b);N_PINS(C)::QAR(A)+S(C)
      • S(j);N_GUARD,S_CUTR(f)::QAR2(A)
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