MESON Chess Problem Database

Problem Display
PID: 134677 (4Q3/7b/7p/3K1kN1/7B/8/8/8 w - - 0 1)

Steel, William M

The Field, 1966

(First published on Thu Apr 28 1966)

4Q3/7b/7p/3K1kN1/7B/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qf7#
  • Tries
    • 1.Sxh7?
      • threat
        • 2.Qe4#
      • 1...Kf4
        • 2.Qe4#
      • 1...Kg4!
    • 1.Qd7+?
      • 1...Kf6
        • 2.Qf7#
      • 1...Kg6
        • 2.Qf7#
      • 1...Kf4!
    • 1.Qf8+?
      • 1...Kg6
        • 2.Qf7#
      • 1...Kg4!
  • Keys
    • 1.Qh5!
      • threat
        • 2.Sh3#
        • 2.Se6#
      • 1...Bg8+
        • 2.Se6#
      • 1...Kf4
        • 2.Qf3#
      • 1...Kf6
        • 2.Se6#
        • 2.Qf7#
      • 1...hxg5
        • 2.Qxg5#
      • 1...Bg6
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR1(D)
  • Tries
    • Try
      • S(C);XB(c)
      • Threat
        • QAB1(D)
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(D)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(D);
    • Threat
      • DUALS(2)
    • Vars
      • B(c);CHECK::QAR(D)+S(C)
      • K(a);P-FLIGHT::QAR1(D)
      • P(b);OGATE,P_SPINP(b),XS(C)::QAR1(D),XP(b)
      • B(c);SBLOCK::QAR2(D)
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