MESON Chess Problem Database

Problem Display
PID: 63765 (2N5/1p1QP1B1/pK1p4/2RNqP1B/4kp2/2p1r3/2P5/8 w - - 0 1)

Sydenham, Colin Peter

1st Prize, The Problemist Jubilee Synthetics Ty., 1977

2N5/1p1QP1B1/pK1p4/2RNqP1B/4kp2/2p1r3/2P5/8

#2

10 + 8

3750 FIDE Album (1977-1979) 1984
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qa4#
    • 1...Qd4
      • 2.Sxd6#
    • 1...Qxf5
      • 2.Sxd6#
      • 2.Qa4#
    • 1...Qe6
      • 2.Qxe6#
  • Tries
    • 1.Sxc3+?
      • 1...Kd4
        • 2.Qa4#
        • 2.Qxd6#
      • 1...Qxc3
        • 2.Sxd6#
      • 1...Rxc3!
    • 1.Sf6+?
      • 1...Kd4
        • 2.Qa4#
      • 1...Qxf6!
    • 1.Sxd6+?
      • 1...Kd4
        • 2.Qa4#
      • 1...Qxd6+!
    • 1.Rc4+?
      • 1...Qd4+
        • 2.Rxd4#
      • 1...Kxd5!
    • 1.Qa4+?
      • 1...Qd4
        • 2.Sf6#
        • 2.Sxd6#
      • 1...Kxf5!
  • Keys
    • 1.Qxd6!
      • threat
        • 2.Qxe5#
      • 1...Qxd6+
        • 2.Sxd6#
      • 1...Kd4
        • 2.Sxc3#
      • 1...Kxf5
        • 2.Qg6#
      • 1...Qxg7
        • 2.Qxf4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qxf5
        • 2.Rc4#
      • 1...Qxe7
        • 2.Qxf4#
      • 1...Qd4
        • 2.Qxf4#
      • 1...Qf6
        • 2.Sxf6#
      • 1...Qe6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT,P_SPINQ(e)::QAR(G)
    • Q(e);N_GUARD,P_PINR(B)::S(J),XP(g)
    • Q(e);OGATEB::QAR2(G),XQ(e)
  • Tries
    • Try
      • S(C);CHECK,XP(a)
      • Vars
        • Q(e);XS(C)::S(J),XP(g)
      • Refutation
        • R(b);XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINP(g)::QAR(G)
      • Refutation
        • Q(e);XS(C)
    • Try
      • S(J);CHECK,XP(g)
      • Vars
        • K(c);P-FLIGHT,P_SPINQ(e)::QAR(G)
      • Refutation
        • Q(e);CHECK,XS(J)
    • Try
      • R(B);CHECK
      • Vars
        • Q(e);CHECK,N_GUARD,P_SPINQ(e)::R1(B),XQ(e)
      • Refutation
        • K(c);P_SPINP(g),S_FLIGHT,XS(C)
    • Try
      • Q(G);CHECK
      • Refutation
        • K(c);S_FLIGHT,XP(D)
  • Actual
    • Q(G);XP(g)
    • Threat
      • QAR1(G),XQ(e)
    • Vars
      • Q(e);CHECK,XQ(G)::S(J),XQ(e)
      • K(c);P-FLIGHT,P_SPINQ(e)::QAR(G)+S(C),XP(a)
      • K(c);OGATEB,S_FLIGHT,XP(D)::QAB1(G)
      • Q(e);OGATE,XB(I)::QAR1(G),XP(d)
      • Q(e);OGATE,XS(C)::QAB1(G),XQ(e)
      • Q(e);N_GUARD,SBLOCK,XP(D)::R(B)
      • Q(e);OGATE,XP(H)::QAR1(G),XP(d)
      • Q(e);OGATE,P_PINR(B)::QAR1(G),XP(d)
      • Q(e);N_GUARD,P_PINQ(G)::S(C),XQ(e)
      • Q(e);OGATEB,P_PINQ(G)::QAR2(G),XQ(e)
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