MESON Chess Problem Database

Problem Display
PID: 15145 (5R2/8/1Q1B4/K2k4/N7/1P2r2B/5N1b/2r5 w - - 0 1)

Sydenham, Colin Peter

Norsk Sjakkblad, 1980

5R2/8/1Q1B4/K2k4/N7/1P2r2B/5N1b/2r5

#2

8 + 4

15513 Selected Chess Problems of Colin Sydenham 2015
133 The Problemist Supplement 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qc5#
    • 1...Rb1
      • 2.Qc5#
    • 1...Rd1
      • 2.Qc5#
    • 1...Rce1
      • 2.Qc5#
    • 1...Rf1
      • 2.Qc5#
    • 1...Rg1
      • 2.Qc5#
    • 1...Rh1
      • 2.Qc5#
    • 1...Rc5+
      • 2.Qxc5#
  • Tries
    • 1.Bxh2?
      • threat
        • 2.Rd8#
        • 2.Qd6#
      • 1...Rc5+
        • 2.Qxc5#
      • 1...Rxb3
        • 2.Be6#
      • 1...Rg3
        • 2.Rf5#
      • 1...Rc7
        • 2.Qd6#
      • 1...Rc8
        • 2.Qd6#
      • 1...Re5
        • 2.Rd8#
      • 1...Re6
        • 2.Bxe6#
      • 1...Re7
        • 2.Qd6#
      • 1...Re8
        • 2.Qd6#
      • 1...Rc6!
  • Keys
    • 1.Be5!
      • threat
        • 2.Qd6#
        • 2.Qe6#
      • 1...Rc5+
        • 2.Qxc5#
      • 1...Kxe5
        • 2.Rf5#
      • 1...Rxb3
        • 2.Qe6#
      • 1...Rxh3
        • 2.Qd6#
      • 1...Rxe5
        • 2.Rd8#
      • 1...Bxe5
        • 2.Be6#
      • 1...Rc6
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD,P_PINS(D)::QAR1(F)
    • R(a);N_GUARD::QAR1(F)
    • R(a);CHECK,N_GUARD::QAR1(F),XR(a)
  • Tries
    • Try
      • B(G);XB(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,N_GUARD::QAR1(F),XR(a)
        • R(c);N_GUARD,XP(B)::B(C)
        • R(c);N_GUARD::R(H)
        • R(a);::QAR1(F)
        • R(c);::R(H)
        • R(c);N_GUARD::B(C),XR(c)
        • R(c);::QAR1(F)
      • Refutation
        • R(a);
  • Actual
    • B(G);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);CHECK,N_GUARD::QAR1(F),XR(a)
      • K(d);OGATEB,P-FLIGHT,XB(G)::R1(H)
      • R(c);XP(B)::QAB1(F)
      • R(c);XB(C)::QAR1(F)
      • R(c);SBLOCK,XB(G)::R(H)
      • B(b);SBLOCK,XB(G)::B(C)
      • R(a);SBLOCK::QAR1(F)
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