MESON Chess Problem Database

Problem Display
PID: 18311 (3nN3/8/b1p3K1/2pk4/2pn4/4Q3/4B3/b7 w - - 0 1)

Sprague, Gordon

Time & Tide, 1954

3nN3/8/b1p3K1/2pk4/2pn4/4Q3/4B3/b7

#2

4 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Bf3#
    • 1...Sb3
      • 2.Bf3#
    • 1...Sf3
      • 2.Bxf3#
    • 1...Sb5
      • 2.Bf3#
    • 1...Sf5
      • 2.Bf3#
    • 1...S4e6
      • 2.Bf3#
  • Keys
    • 1.Qf4!
      • threat
        • 2.Sc7#
      • 1...Ke6
        • 2.Qd6#
      • 1...Sb5
        • 2.Bxc4#
      • 1...S4e6
        • 2.Bf3#
      • 1...S8e6
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(c);N_GUARD::B(A)
    • S(c);N_GUARD::B(A),XS(c)
  • Actual
    • Q(B);
    • Threat
      • S(D)
    • Vars
      • K(e);S_FLIGHT::QAR1(B)
      • S(c);S_CUTB(f)::B(A),XP(b)
      • S(c);N_GUARD,SBLOCK::B(A)
      • S(h);SBLOCK::S(D)
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