MESON Chess Problem Database

Problem Display
PID: 51449 (7B/8/5N2/1B3p2/8/4kp2/2QN3K/8 w - - 0 1)

Holdsworth, J

The Guardian, 1961

7B/8/5N2/1B3p2/8/4kp2/2QN3K/8

#2

6 + 3

5454 Near Snap 2008

SOLUTION

  • SOUND
  • Sets
    • 1...f2
      • 2.Sd5#
    • 1...f4
      • 2.Sg4#
  • Tries
    • 1.Sc4+?
      • 1...Kf4
        • 2.Qc1#
        • 2.Qd2#
      • 1...Kd4!
    • 1.Sde4?
      • threat
        • 2.Sd5#
        • 2.Qd2#
      • 1...Kd4
        • 2.Qc3#
        • 2.Qc5#
      • 1...fxe4
        • 2.Sd5#
      • 1...f2
        • 2.Qxf2#
      • 1...Kf4!
    • 1.Sh5?
      • threat
        • 2.Sf1#
        • 2.Sc4#
      • 1...f2
        • 2.Qd3#
        • 2.Qc3#
      • 1...Kf2!
  • Keys
    • 1.Qc1!
      • 1...Kf2
        • 2.Qg1#
      • 1...Kd4
        • 2.Sxf3#
      • 1...Kf4
        • 2.Sc4#
      • 1...f2
        • 2.Sd5#
      • 1...f4
        • 2.Sg4#

This anticipates 12002(1973)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::S(E)
    • P(c);N_GUARD,SBLOCK::S(E)
  • Tries
    • Try
      • S(B);CHECK
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);XS(B)::S(E)
        • P(b);::QAB1(A),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);S_FLIGHT::S(B),XP(b)
      • K(a);S_FLIGHT::QAB(A)+S(B)
      • P(b);SBLOCK::S(E)
      • P(c);N_GUARD,SBLOCK::S(E)
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