MESON Chess Problem Database

Problem Display
PID: 60132 (8/7Q/8/3N2B1/2p5/2p5/npP1PK2/1q1k4 w - - 0 1)

Whalley, JR

1/2 Prize, The Australian Meredith Ty., 1928

8/7Q/8/3N2B1/2p5/2p5/npP1PK2/1q1k4

#2

6 + 6

14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Qh1#
    • 1...Sc1
      • 2.Sxc3#
    • 1...Sb4
      • 2.Sxc3#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Qh1#
        • 2.Qd7#
      • 1...Qxc2
        • 2.Qxc2#
        • 2.Qh1#
      • 1...Qc1
        • 2.Qh1#
      • 1...Sc1
        • 2.Qh1#
      • 1...Sxb4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Sb4#
      • 1...Kxc2
        • 2.Qa4#
      • 1...Qxc2
        • 2.Sxc3#
      • 1...Qc1
        • 2.Se3#
      • 1...Sc1
        • 2.Se3#
      • 1...Sb4
        • 2.Sxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(a);P_PINP(B),SBLOCK,XP(A)::QAR(F)
    • S(c);N_GUARD::S(D),XP(e)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::QAR(F)
        • S(c);::QAR(F)
      • Refutation
        • S(c);XS(D)
  • Actual
    • Q(F);
    • Threat
      • QAR(F)+S(D)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XP(A)::QAB(F)
      • Q(a);P_PINP(B),SBLOCK,XP(A)::QAR(F)+S(D),DCHECK,XP(e)
      • Q(a);SBLOCK::QAR(F)+S(D),DCHECK
      • S(c);SBLOCK::QAR(F)+S(D),DCHECK
      • S(c);::QAR(F)+S(D),XS(c)
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