MESON Chess Problem Database

Problem Display
PID: 271885 (1Q6/1N6/2pn4/3q4/2PkP2R/P5R1/5P2/K4BB1 w - - 0 1)

Driver, John Edward

The Problemist, 1956

1Q6/1N6/2pn4/3q4/2PkP2R/P5R1/5P2/K4BB1

#2

11 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4
      • 2.Qh8#
    • 1...Qxe4
      • 2.Qxd6#
      • 2.Qh8#
    • 1...Sxc4
      • 2.Rd3#
    • 1...Sb5
      • 2.exd5#
    • 1...Sf7
      • 2.exd5#
    • 1...Sc8
      • 2.exd5#
    • 1...Se8
      • 2.exd5#
  • Tries
    • 1.exd5+?
      • 1...Se4
        • 2.Qh8#
      • 1...Ke5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.f4#
      • 1...Kxc5
        • 2.Qa7#
      • 1...Ke5
        • 2.Qh8#
      • 1...Qxe4
        • 2.Qxd6#
      • 1...Qxc5
        • 2.Qb2#
      • 1...Sxc4
        • 2.Sb3#
      • 1...Sxe4
        • 2.Sb3#
      • 1...Sf5
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD,XP(G)::QAB(K)
    • S(d);SBLOCK,XP(G)::R1(F)
    • S(d);N_GUARD::R(I)+P(H),XQ(b)
  • Tries
    • Try
      • P(H);CHECK,XQ(b)
      • Vars
        • S(d);P_SPINS(d)::QAB(K)
      • Refutation
        • K(a);P_SPINS(d),S_FLIGHT
  • Actual
    • S(J);
    • Threat
      • B(C)+P(D)
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(J)::QAB(K)
      • K(a);N_GUARD,P_SPINS(d),S_CUTQ(b),S_FLIGHT::QAB(K)
      • Q(b);OGATEB,P_SPINQ(b),XP(H)::QAR2(K),XS(d)
      • Q(b);SBLOCK,XS(J)::QAB(K)
      • S(d);XP(G)::S(J)
      • S(d);P_SPINS(d),XP(H)::S(J)
      • S(d);::S(J)
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