MESON Chess Problem Database

Problem Display
PID: 159118 (1b2nR2/3p4/4k3/rn3R2/1Q6/1NN4K/8/8 w - - 0 1)

Sydenham, Colin Peter

British Chess Magazine, 1976

1b2nR2/3p4/4k3/rn3R2/1Q6/1NN4K/8/8

#2

6 + 6

15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sd4#
    • 1...Sxc3
      • 2.Sd4#
    • 1...Sd4
      • 2.Sxd4#
    • 1...Sa7
      • 2.Sd4#
    • 1...Sbc7
      • 2.Sd4#
    • 1...Sf6
      • 2.R8xf6#
    • 1...Sec7
      • 2.R8f6#
    • 1...Sg7
      • 2.R8f6#
  • Tries
    • 1.Re5+?
      • 1...Kxe5
        • 2.Qe7#
      • 1...Bxe5!
    • 1.R5f6+?
      • 1...Ke5
        • 2.Qe7#
        • 2.Qe4#
        • 2.Qf4#
      • 1...Sxf6!
    • 1.Qe4+?
      • 1...Be5
        • 2.Qxe5#
      • 1...Kd6!
  • Keys
    • 1.R8f7!
      • threat
        • 2.Qe7#
      • 1...Sf6
        • 2.R7xf6#
      • 1...Bd6
        • 2.Qc4#
      • 1...Sbd6
        • 2.Sd4#
      • 1...Sed6
        • 2.Sc5#
      • 1...d6
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • S(b);N_GUARD::S(A)
    • S(b);N_GUARD,XS(B)::S(A)
    • S(b);N_GUARD::S(A),XS(b)
    • S(f);N_GUARD::R1(F),XS(f)
    • S(f);N_GUARD::R1(F)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(c);P-FLIGHT,XR(E)::QAR2(D)
      • Refutation
        • B(e);XR(E)
    • Try
      • R(E);CHECK
      • Refutation
        • S(f);XR(E)
    • Try
      • Q(D);CHECK
      • Vars
        • B(e);N_GUARD,P_SPINB(e)::QAR1(D),XB(e)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(F);
    • Threat
      • QAR1(D)
    • Vars
      • S(f);N_GUARD::R1(F),XS(f)
      • B(e);SBLOCK,S_CUTP(d)::QAB(D)
      • S(b);N_GUARD::S(A)
      • S(f);SBLOCK::S(A)
      • P(d);SBLOCK,S_CUTB(e)::QAR2(D)
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