MESON Chess Problem Database

Problem Display
PID: 258466 (1K6/B3ppp1/Q5bR/1P1NkpNq/1PB1pRP1/6P1/2nP4/8 w - - 0 1)

Sydenham, Colin Peter

1st HM., British Chess Magazine 02. TT, 1986

1K6/B3ppp1/Q5bR/1P1NkpNq/1PB1pRP1/6P1/2nP4/8

#2

13 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Sf3#
    • 1...f6
      • 2.Qe6#
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qc7#
        • 2.Qxe7#
      • 1...Kd6
        • 2.Qc7#
        • 2.Qxe7#
      • 1...Sd4
        • 2.Qc7#
      • 1...e6
        • 2.Qc7#
      • 1...Qxg5!
    • 1.Qc8?
      • threat
        • 2.Qc7#
      • 1...Kd6
        • 2.Sxf7#
        • 2.Qc7#
      • 1...Qxg5!
    • 1.Qa5?
      • threat
        • 2.Qc7#
      • 1...Kd6
        • 2.Qc7#
      • 1...Qxg5!
    • 1.d4+?
      • 1...exd4 ep
        • 2.Sf3#
      • 1...Sxd4!
  • Keys
    • 1.Sb6!
      • threat
        • 2.Sd7#
      • 1...Kd4
        • 2.Sf3#
      • 1...Kd6
        • 2.Sxf7#
      • 1...Kf6
        • 2.Rxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(b);N_GUARD::S(I)
    • P(h);N_GUARD::QAR1(J)
  • Tries
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::QAB(J)
        • P(g);::QAB(J)
      • Refutation
        • Q(e);XS(I)
    • Try
      • Q(J);
      • Threat
        • QAB(J)
      • Refutation
        • Q(e);XS(I)
    • Try
      • Q(J);
      • Threat
        • QAB(J)
      • Vars
        • K(c);P_SPINB(f),S_FLIGHT::QAB1(J)
      • Refutation
        • Q(e);XS(I)
    • Try
      • P(A);CHECK
      • Vars
        • P(b);EP,XP(A)::S(I)
      • Refutation
        • S(a);XP(A)
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • K(c);N_GUARD,P_SPINP(b),S_FLIGHT::S(I)
      • K(c);N_GUARD,P_SPINB(f),S_FLIGHT::S(I),XP(h)
      • K(c);N_GUARD,P_SPINB(f),P_SPINP(d),S_FLIGHT::R1(E),XP(d)
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