MESON Chess Problem Database

Problem Display
PID: 159460 (bQ4n1/3p1B2/5R1B/3N1p2/1bpPk1p1/8/4PpNq/1K1R4 w - - 0 1)

Sydenham, Colin Peter

Neue Zurcher Zeitung, 1978

bQ4n1/3p1B2/5R1B/3N1p2/1bpPk1p1/8/4PpNq/1K1R4

#2

10 + 10

15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qf4
      • 2.Qxf4#
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qh1
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qxg2
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qh3
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qh4
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qh5
      • 2.Qf4#
      • 2.Qe5#
    • 1...Qxh6
      • 2.Qe5#
    • 1...Ba3
      • 2.Sc3#
    • 1...Bc3
      • 2.Sxc3#
    • 1...Bc5
      • 2.Sc3#
    • 1...Bd6
      • 2.Sc3#
    • 1...Be7
      • 2.Sc3#
    • 1...Bf8
      • 2.Sc3#
    • 1...Sxf6
      • 2.Sxf6#
    • 1...g3
      • 2.Qf4#
      • 2.Qe5#
    • 1...f4
      • 2.Qe5#
  • Tries
    • 1.Sgf4?
      • threat
        • 2.Qe5#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...d6
        • 2.Re6#
      • 1...Bd6!
    • 1.Bf4?
      • threat
        • 2.Qe5#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...Bd6
        • 2.Sc3#
      • 1...d6!
    • 1.Re6+?
      • 1...Kxd5
        • 2.Se3#
        • 2.Qxa8#
      • 1...Qe5
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...dxe6!
    • 1.Qxh2?
      • threat
        • 2.Qf4#
        • 2.Qe5#
      • 1...Bd2
        • 2.Qe5#
      • 1...f1Q
        • 2.Qe5#
      • 1...f1R
        • 2.Qe5#
      • 1...Bd6
        • 2.Sc3#
      • 1...f4
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...d6
        • 2.Qf4#
      • 1...g3!
    • 1.Qxa8?
      • threat
        • 2.Sc3#
      • 1...Bc3
        • 2.Sxc3#
      • 1...c3
        • 2.Sxc3#
      • 1...Bd2!
    • 1.Qe8+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...Be7
        • 2.Sc3#
      • 1...Se7!
  • Keys
    • 1.Sdf4!
      • threat
        • 2.Qe5#
      • 1...Qxf4
        • 2.Qxf4#
      • 1...Bd6
        • 2.Qxa8#
      • 1...d6
        • 2.Re6#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(b);N_GUARD::QAR1(J),XQ(b)
    • Q(b);N_GUARD,XB(H)::QAR1(J)
    • B(c);N_GUARD::S(F)
    • B(c);N_GUARD::S(F),XB(c)
    • S(j);XR(G)::S(F),XS(j)
    • P(g);S_CUTQ(b)::QAR1(J)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAR1(J)
      • Vars
        • Q(b);OGATE,XS(D)::QAR1(J),XQ(b)
        • P(h);N_GUARD::R(G)
      • Refutation
        • B(c);
    • Try
      • B(H);
      • Threat
        • QAR1(J)
      • Vars
        • Q(b);OGATE,XB(H)::QAR1(J),XQ(b)
        • B(c);N_GUARD::S(F)
      • Refutation
        • P(h);
    • Try
      • R(G);CHECK
      • Refutation
        • P(h);XR(G)
    • Try
      • Q(J);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAR1(J)
        • P(a);P_PINR(B)::QAR1(J)
        • B(c);N_GUARD::S(F)
        • P(h);::QAR1(J)
      • Refutation
        • P(f);
    • Try
      • Q(J);XB(i)
      • Threat
        • QAB(J)+S(F),DCHECK
      • Vars
        • B(c);::QAB(J)+S(F),DCHECK,XB(c)
        • P(d);::QAB(J)+S(F),DCHECK,XP(d)
      • Refutation
        • B(c);
    • Try
      • Q(J);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR1(J),XQ(b)
        • B(c);P_SPINB(c)::S(F)
      • Refutation
        • S(j);P_SPINS(j)
  • Actual
    • S(F);
    • Threat
      • QAR1(J)
    • Vars
      • Q(b);OGATE,XS(F)::QAR1(J),XQ(b)
      • B(c);S_CUTP(h)::QAB(J),XB(i)
      • P(h);N_GUARD::R(G)
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