MESON Chess Problem Database

Problem Display
PID: 18168 (2NNn3/Kp6/8/3k4/B7/1Pp1Q3/2Pr4/7b w - - 0 1)

Sprague, Gordon

Time & Tide, 1953

2NNn3/Kp6/8/3k4/B7/1Pp1Q3/2Pr4/7b

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Sb6#
      • 2.Se7#
    • 1...b6
      • 2.Bc6#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Sb6#
        • 2.Se7#
        • 2.Qe5#
      • 1...Rd4
        • 2.Qe5#
      • 1...b5
        • 2.Se7#
      • 1...Re2
        • 2.Sb6#
        • 2.Se7#
      • 1...b6
        • 2.Sxb6#
        • 2.Se7#
        • 2.Qe5#
      • 1...Be4!
    • 1.Qe6+?
      • 1...Kc5
        • 2.Qc4#
      • 1...Kd4!
  • Keys
    • 1.b4!
      • threat
        • 2.Bb3#
      • 1...Kc4
        • 2.Qc5#
      • 1...Be4
        • 2.Qc5#
      • 1...Rd4
        • 2.Qe6#
      • 1...Sd6
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(e);N_GUARD::B(D)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);::QAR1(C)
        • P(e);::S(F)
      • Refutation
        • B(a);
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT::QAR1(C)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • P(B);
    • Threat
      • B(D)
    • Vars
      • K(d);S_FLIGHT::QAR1(C)
      • B(a);SBLOCK::QAR1(C)
      • R(b);SBLOCK::QAB1(C)
      • S(f);SBLOCK::S(F)
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