MESON Chess Problem Database

Problem Display
PID: 42931 (KN6/bR1pR1N1/2PQ4/3b1p1p/1npk2n1/3P1r2/3PP3/7q w - - 0 1)

Sydenham, Colin Peter

1st Prize, The Problemist, 1977/II

KN6/bR1pR1N1/2PQ4/3b1p1p/1npk2n1/3P1r2/3PP3/7q

#2

10 + 11

4258 Brian Harley Award 1977-1978
56 The Problemist 1980
3750 FIDE Album (1977-1979) 1984
102 Probleemblad 2002
56 The Problemist 2006
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd3
      • 2.Sxf5#
    • 1...Re3
      • 2.Sxf5#
    • 1...Rg3
      • 2.Sxf5#
    • 1...Rh3
      • 2.Sxf5#
    • 1...cxd3
      • 2.Rxb4#
    • 1...c3
      • 2.Rxb4#
    • 1...f4
      • 2.Sf5#
      • 2.Re4#
    • 1...dxc6
      • 2.Se6#
  • Tries
    • 1.Sxd7?
      • threat
        • 2.Se6#
      • 1...Rxd3
        • 2.Sxf5#
      • 1...cxd3
        • 2.Rxb4#
      • 1...Re3
        • 2.Sxf5#
      • 1...Sxd3!
    • 1.Rexd7?
      • threat
        • 2.Se6#
      • 1...Sxd3
        • 2.Qxd5#
      • 1...cxd3
        • 2.Rxb4#
      • 1...Re3
        • 2.Sxf5#
      • 1...Rxd3!
    • 1.Qe5+?
      • 1...Kc5
        • 2.d4#
      • 1...Sxe5!
    • 1.cxd7?
      • threat
        • 2.Se6#
      • 1...Rxd3
        • 2.Sxf5#
      • 1...Sxd3
        • 2.Sc6#
      • 1...Re3
        • 2.Sxf5#
      • 1...cxd3!
  • Keys
    • 1.Rbxd7!
      • threat
        • 2.Se6#
      • 1...Rxd3
        • 2.Sxf5#
      • 1...Sxd3
        • 2.Qxd5#
      • 1...cxd3
        • 2.Qxb4#
      • 1...Re3
        • 2.Sxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(b);N_GUARD,XP(C)::S(H),XP(h)
    • R(b);N_GUARD::S(H),XP(h)
    • P(d);OGATEB,XP(C)::R(F),XS(c)
    • P(d);OGATEB::R(F),XS(c)
    • P(k);N_GUARD,XP(D)::S(H)
  • Tries
    • Try
      • S(J);XP(k)
      • Threat
        • S(H)
      • Vars
        • R(b);N_GUARD,XP(C)::S(H),XP(h)
        • P(d);OGATEB,XP(C)::R(F),XS(c)
        • R(b);N_GUARD::S(H),XP(h)
      • Refutation
        • S(c);XP(C)
    • Try
      • R(G);XP(k)
      • Threat
        • S(H)
      • Vars
        • S(c);N_GUARD,XP(C)::QAR1(E),XB(g)
        • P(d);OGATEB,XP(C)::R(F),XS(c)
        • R(b);N_GUARD::S(H),XP(h)
      • Refutation
        • R(b);XP(C)
    • Try
      • Q(E);CHECK,N_PINB(g)
      • Vars
        • K(e);OGATE,P_SPINB(g),S_FLIGHT::P(C)
      • Refutation
        • S(f);XQ(E)
    • Try
      • P(D);P_SPINR(F),XP(k)
      • Threat
        • S(H)
      • Vars
        • R(b);N_GUARD,XP(C)::S(H),XP(h)
        • S(c);N_GUARD,XP(C)::S(J)
        • R(b);N_GUARD::S(H),XP(h)
      • Refutation
        • P(d);XP(C)
  • Actual
    • R(F);P_SPINP(D),XP(k)
    • Threat
      • S(H)
    • Vars
      • R(b);N_GUARD,XP(C)::S(H),XP(h)
      • S(c);N_GUARD,XP(C)::QAR1(E),XB(g)
      • P(d);OGATEB,XP(C)::QAR2(E),XS(c)
      • R(b);N_GUARD::S(H),XP(h)
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