MESON Chess Problem Database

Problem Display
PID: 32836 (5KB1/1N1Q4/nP6/1P1N2p1/2k5/2p1p3/2P5/1qn5 w - - 0 1)

Whalley, JR

The Problemist, 1928

5KB1/1N1Q4/nP6/1P1N2p1/2k5/2p1p3/2P5/1qn5

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4+
      • 2.Se7#
    • 1...Qxb5
      • 2.Qg4#
    • 1...Sb4
      • 2.Sxe3#
  • Tries
    • 1.Qc6+?
      • 1...Sc5
        • 2.Qxc5#
      • 1...Kd4!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Sc7#
      • 1...Kd4
        • 2.Sf6#
      • 1...Kxb5
        • 2.Sxc3#
      • 1...Qxb5
        • 2.Sxe3#
      • 1...Sb4
        • 2.Qc5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sc7
        • 2.Sxc7#
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(a);CHECK,SBLOCK::B(H)+S(C)
    • Q(a);SBLOCK,XP(B)::QAR(F)
    • S(g);SBLOCK::B(H)+S(C),DCHECK,XP(d)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR1(F),XS(g)
      • Refutation
        • K(e);P-FLIGHT
  • Actual
    • Q(F);
    • Threat
      • B(H)+S(C)
    • Vars
      • K(e);P-FLIGHT::QAR(F)+S(C)
      • K(e);S_FLIGHT,XP(B)::S(C),XP(c)
      • Q(a);SBLOCK,XP(B)::B(H)+S(C),DCHECK,XP(d)
      • S(g);N_GUARD::QAR1(F)
      • S(g);N_GUARD::QAR1(F),XS(g)
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