MESON Chess Problem Database

Problem Display
PID: 210736 (1NN1n2K/2p3Q1/2PB4/kp1b3R/p7/2R5/3pr3/5B2 w - - 0 1)

Draper, H Jack

The Problemist, 1985

1NN1n2K/2p3Q1/2PB4/kp1b3R/p7/2R5/3pr3/5B2

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sf6
      • 2.Qxc7#
    • 1...a3
      • 2.Rxa3#
    • 1...b4
      • 2.Rc5#
      • 2.Rxd5#
  • Tries
    • 1.Bxc7+?
      • 1...Kb4
        • 2.Sa6#
      • 1...Sxc7!
    • 1.Rc4?
      • threat
        • 2.Bb4#
      • 1...Bxc4
        • 2.Qc3#
      • 1...Sxd6
        • 2.Qxc7#
      • 1...bxc4
        • 2.Rxd5#
      • 1...cxd6
        • 2.Qa7#
      • 1...b4
        • 2.Rc5#
        • 2.Rxd5#
      • 1...a3!
  • Keys
    • 1.Rb3!
      • threat
        • 2.Bb4#
      • 1...Bxb3
        • 2.Qc3#
      • 1...Sxd6
        • 2.Qxc7#
      • 1...axb3
        • 2.Qa1#
      • 1...cxd6
        • 2.Qa7#
      • 1...a3
        • 2.Rxa3#
      • 1...b4
        • 2.Rxd5#
      • 1...Re4
        • 2.Rxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • S(h);N_GUARD::QAB(F),XP(g)
    • P(c);OGATEB::R(B),XP(c)
  • Tries
    • Try
      • B(E);CHECK,XP(g)
      • Vars
        • K(d);S_FLIGHT::S(G)
      • Refutation
        • S(h);XB(E)
    • Try
      • R(B);
      • Threat
        • B(E)
      • Vars
        • B(f);P_SPINP(e),XR(B)::QAB(F)
        • S(h);N_GUARD,XB(E)::QAB(F),XP(g)
        • P(e);OGATEB,P_SPINB(f),XR(B)::R(C),XB(f)
        • P(g);OGATE,XB(E)::QAR2(F)
      • Refutation
        • P(c);
  • Actual
    • R(B);
    • Threat
      • B(E)
    • Vars
      • B(f);P_SPINP(e),XR(B)::QAB(F)
      • S(h);N_GUARD,XB(E)::QAB(F),XP(g)
      • P(c);OGATEB,XR(B)::QAR(F)
      • P(g);OGATE,XB(E)::QAR2(F)
      • P(c);OGATEB::R(B),XP(c)
      • P(e);OGATEB,P_SPINB(f)::R(C),XB(f)
      • R(b);::R1(B),XP(e)
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