MESON Chess Problem Database

Problem Display
PID: 160267 (r1q2R2/4Qbp1/3PN1p1/R1p1k3/5p2/5P2/BbK5/6B1 w - - 0 1)

Sydenham, Colin Peter

2nd Comm., Veliky-65 JT, 2001-2002

r1q2R2/4Qbp1/3PN1p1/R1p1k3/5p2/5P2/BbK5/6B1

#2

9 + 9

15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qg5#
    • 1...Qa6
      • 2.Rxc5#
    • 1...Qxe6
      • 2.Rxc5#
    • 1...Qd7
      • 2.Rxc5#
    • 1...Qb8
      • 2.Rxc5#
    • 1...Qd8
      • 2.Rxc5#
    • 1...Qe8
      • 2.Rxc5#
    • 1...Qxf8
      • 2.Rxc5#
  • Tries
    • 1.Sd4+?
      • 1...Qe6
        • 2.Rxc5#
      • 1...Be6!
    • 1.Sc7+?
      • 1...Qe6
        • 2.Rxc5#
      • 1...Be6
        • 2.Rxc5#
      • 1...Kf5!
    • 1.Sxg7+?
      • 1...Qe6
        • 2.Rxc5#
      • 1...Be6!
    • 1.Bd4+?
      • 1...Kf5
        • 2.Sxg7#
        • 2.Rxf7#
        • 2.Qg5#
        • 2.Qxf7#
      • 1...Bxd4!
    • 1.Rd8?
      • threat
        • 2.Qg5#
      • 1...Kf5
        • 2.Qg5#
      • 1...Qxe6
        • 2.Rxc5#
      • 1...Qxd8
        • 2.Rxc5#
      • 1...Qd7
        • 2.Rxc5#
      • 1...g5
        • 2.Qxg5#
      • 1...Bxe6!
  • Keys
    • 1.Bxc5!
      • threat
        • 2.Qg5#
      • 1...Qxc5+
        • 2.Rxc5#
      • 1...Kf5
        • 2.Qg5#
      • 1...Qxe6
        • 2.Ba7#
      • 1...Bxe6
        • 2.Qxg7#
      • 1...Qd8
        • 2.Bd4#
      • 1...g5
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • K(d);P-FLIGHT,P_SPINB(f)::QAR1(H)
    • Q(i);N_GUARD::R(E),XP(c)
    • Q(i);N_GUARD,P_SPINQ(i),XS(G)::R(E),XP(c)
    • Q(i);N_GUARD,XR(I)::R(E),XP(c)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • Q(i);P_SPINQ(i)::R(E),XP(c)
      • Refutation
        • B(f);P_SPINB(f)
    • Try
      • S(G);CHECK
      • Vars
        • Q(i);P_SPINQ(i)::R(E),XP(c)
        • B(f);P_SPINB(f)::R(E),XP(c)
      • Refutation
        • K(d);P-FLIGHT,P_SPINB(f)
    • Try
      • S(G);CHECK,XP(g)
      • Vars
        • Q(i);P_SPINQ(i)::R(E),XP(c)
      • Refutation
        • B(f);P_SPINB(f)
    • Try
      • B(A);CHECK
      • Refutation
        • B(a);XB(A)
    • Try
      • R(I);
      • Threat
        • QAR2(H)
      • Vars
        • K(d);P-FLIGHT::QAR1(H)
        • Q(i);N_GUARD,P_SPINQ(i),XS(G)::R(E),XP(c)
        • Q(i);N_GUARD,XR(I)::R(E),XP(c)
        • Q(i);N_GUARD::R(E),XP(c)
        • P(e);::QAR2(H),XP(e)
      • Refutation
        • B(f);P_SPINB(f),XS(G)
  • Actual
    • B(A);P_SPINB(A),XP(c)
    • Threat
      • QAR2(H)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),XB(A)::R(E),XQ(i)
      • K(d);P-FLIGHT,P_SPINB(f)::QAR1(H)
      • Q(i);N_PINB(A),P_SPINQ(i),XS(G)::R(E)+B(A)
      • B(f);OGATE,P_SPINB(f),XS(G)::QAB(H),XP(g)
      • Q(i);N_PINB(A)::R(E)+B(A),DCHECK
      • P(e);::QAR2(H),XP(e)
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