MESON Chess Problem Database

Problem Display
PID: 146682 (Q7/2R5/8/3N4/2bk1K2/n7/8/8 w - - 0 1)

Whitehead, Cyril

Australian Chess Problem Magazine, 1993

Q7/2R5/8/3N4/2bk1K2/n7/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Sb4?
      • threat
        • 2.Qh8#
      • 1...Bg8
        • 2.Qe4#
        • 2.Qa7#
      • 1...Kc3!
    • 1.Qe8?
      • threat
        • 2.Qe4#
      • 1...Kxd5
        • 2.Qd7#
        • 2.Qe5#
      • 1...Bxd5
        • 2.Qe3#
      • 1...Bd3
        • 2.Qe5#
      • 1...Kd3!
    • 1.Qh8+?
      • 1...Kxd5
        • 2.Qe5#
      • 1...Kd3!
  • Keys
    • 1.Qa4!
      • 1...Kd3
        • 2.Qd1#
      • 1...Kxd5
        • 2.Qd7#
      • 1...Sb1
        • 2.Qxc4#
      • 1...Sc2
        • 2.Qxc4#
      • 1...Sb5
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB(D)
      • Refutation
        • K(c);P_SPINB(b),S_FLIGHT
    • Try
      • Q(D);
      • Threat
        • QAR1(D)
      • Vars
        • B(b);SBLOCK,XS(B)::QAB1(D)
        • B(b);SBLOCK::QAB1(D)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(c);P-FLIGHT,XS(B)::QAR1(D)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(D);P_PINB(b)
    • Vars
      • K(c);N_SPINB(b),P-FLIGHT::QAR2(D)
      • K(c);N_SPINB(b),OGATEB,P-FLIGHT,XS(B)::QAR2(D)
      • S(a);N_GUARD::QAR1(D),XB(b)
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