MESON Chess Problem Database

Problem Display
PID: 188017 (8/1p1Npr2/n3n1Q1/Bp1k3r/8/3N1P2/2R5/2K2B2 w - - 0 1)

Boorer, PA

The Observer, 1936

(First published on Sun Oct 18 1936)

8/1p1Npr2/n3n1Q1/Bp1k3r/8/3N1P2/2R5/2K2B2

#2

8 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qe4#
    • 1...Sd4
      • 2.Sb6#
  • Tries
    • 1.Sb6+?
      • 1...Kd4
        • 2.Qe4#
        • 2.Qg1#
      • 1...Kd6!
    • 1.Qxe6+?
      • 1...Kd4
        • 2.Bc3#
        • 2.Qe4#
      • 1...Kxe6!
  • Keys
    • 1.Rd2!
      • threat
        • 2.Sb4#
      • 1...Kc4
        • 2.S3c5#
      • 1...Kd4
        • 2.Qe4#
      • 1...Kc6
        • 2.Qxe6#
      • 1...Kd6
        • 2.S3e5#
      • 1...Sb4
        • 2.Sxb4#
      • 1...Sd4
        • 2.Sb6#
      • 1...b4
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(G)
    • S(e);SBLOCK::S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Refutation
        • K(b);P-FLIGHT,P_SPINS(e)
    • Try
      • Q(G);CHECK,XS(e)
      • Refutation
        • K(b);S_FLIGHT,XQ(G)
  • Actual
    • R(C);
    • Threat
      • R(C)+S(D),DCHECK
    • Vars
      • K(b);S_FLIGHT::B(B)+S(D)
      • K(b);P-FLIGHT::QAR1(G)
      • K(b);P_SPINS(e),S_FLIGHT::QAR2(G),XS(e)
      • K(b);P-FLIGHT,P_SPINS(e)::R(C)+S(D)
      • S(d);::R(C)+S(D),DCHECK,XS(d)
      • S(e);SBLOCK::S(H)
      • P(a);::R(C)+S(D),DCHECK,XP(a)
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