MESON Chess Problem Database

Problem Display
PID: 856 (8/2Qp4/b7/r7/rkpNR3/b3B2R/np6/3BK3 w - - 0 1)

Sydenham, Colin Peter

1st Prize, British Chess Magazine, 1979

8/2Qp4/b7/r7/rkpNR3/b3B2R/np6/3BK3

#2

7 + 9

3750 FIDE Album (1977-1979) 1984
4640 Chess Wizardry: The New ABC of Chess Problems 1996
133 The Problemist Supplement 2011
15513 Selected Chess Problems of Colin Sydenham 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Bd2#
  • Tries
    • 1.Sc2+?
      • 1...Kc3
        • 2.Bc1#
        • 2.Bg1#
        • 2.Bd2#
        • 2.Bf2#
        • 2.Bd4#
        • 2.Bf4#
        • 2.Bc5#
        • 2.Bg5#
        • 2.Bb6#
        • 2.Bh6#
        • 2.Ba7#
      • 1...Kb5
        • 2.Qb6#
        • 2.Qxd7#
      • 1...Kb3!
    • 1.Sc6+?
      • 1...Kc3
        • 2.Bc1#
        • 2.Bg1#
        • 2.Bd2#
        • 2.Bf2#
        • 2.Bd4#
        • 2.Bf4#
        • 2.Bc5#
        • 2.Bg5#
        • 2.Bb6#
        • 2.Bh6#
        • 2.Ba7#
      • 1...Kb5
        • 2.Qb6#
      • 1...dxc6!
    • 1.Bd2+?
      • 1...Sc3
        • 2.Bxc3#
      • 1...c3!
    • 1.Qd6+?
      • 1...Kc3
        • 2.Se2#
        • 2.Bc1#
        • 2.Bg1#
        • 2.Bd2#
        • 2.Bf2#
        • 2.Bf4#
        • 2.Bg5#
        • 2.Bh6#
      • 1...Rc5!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qxc4#
        • 2.Qc5#
      • 1...Kxb5
        • 2.Qb6#
      • 1...Rxb5
        • 2.Rxc4#
      • 1...Bxb5
        • 2.Bc5#
      • 1...d5
        • 2.Qc5#
      • 1...d6
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • K(e);P_SPINP(f),S_FLIGHT::R(D)+B(C),DCHECK
  • Tries
    • Try
      • S(E);CHECK,P_PINP(f)
      • Refutation
        • K(e);N_SPINP(f),P-FLIGHT
    • Try
      • S(E);CHECK,P_PINP(f)
      • Vars
        • K(e);N_SPINP(f),P-FLIGHT::QAR1(G)
      • Refutation
        • P(i);XS(E)
    • Try
      • B(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::B(C),XS(a)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(G);CHECK
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • S(E);P_PINP(f)
    • Threat
      • DUALS(2)
    • Vars
      • K(e);N_SPINP(f),OGATEB,P-FLIGHT,XS(E)::QAR1(G)
      • R(g);SBLOCK,XS(E)::R1(F),XP(f)
      • B(h);SBLOCK,XS(E)::B(C)
      • P(i);::QAB1(G)
      • P(i);::QAR1(G),XP(f)
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