MESON Chess Problem Database

Problem Display
PID: 15672 (2KNknR1/1pR1p3/7b/4P3/8/3QNB2/3rqr2/1b6 w - - 0 1)

Sydenham, Colin Peter

2nd HM., US Problem Bulletin, 1986

2KNknR1/1pR1p3/7b/4P3/8/3QNB2/3rqr2/1b6

#2

8 + 9

3297 FIDE Album (1986-1988) 1995
4849 The Sushkov Theme 1999
15513 Selected Chess Problems of Colin Sydenham 2015
145 StrateGems 2016
56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qd7#
    • 1...Rb2
      • 2.Qd7#
    • 1...Rc2
      • 2.Qg6#
      • 2.Qd7#
    • 1...b5
      • 2.Bc6#
    • 1...b6
      • 2.Bc6#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Rxe7#
      • 1...Qxe5
        • 2.Qb5#
      • 1...Rc2
        • 2.Qg6#
      • 1...e6
        • 2.Sf6#
        • 2.Re7#
      • 1...Bg5!
    • 1.Bh5+?
      • 1...Rf7
        • 2.Bxf7#
      • 1...Qxh5!
    • 1.Qb5+?
      • 1...Rd7
        • 2.Qxd7#
      • 1...Qxb5!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Rxe7#
      • 1...Qxe5
        • 2.Bh5#
      • 1...Rc2
        • 2.Qd7#
      • 1...Bg5
        • 2.Sg7#
      • 1...e6
        • 2.Sd6#
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(b);N_GUARD::QAB1(A)
    • P(f);N_GUARD::B(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • R1(E),XP(g)
      • Vars
        • Q(c);N_GUARD,XP(D)::QAB(A)
        • R(b);P_PINR(E),S_CUTB(a)::QAB(A)
      • Refutation
        • B(e);
    • Try
      • B(C);CHECK
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::B(C),XR(d)
      • Refutation
        • Q(c);XB(C)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(A),XR(b)
      • Refutation
        • Q(c);XQ(A)
  • Actual
    • S(B);
    • Threat
      • R1(E),XP(g)
    • Vars
      • Q(c);N_GUARD,XP(D)::B(C)
      • R(b);N_GUARD,P_PINR(E)::QAB1(A)
      • B(e);N_GUARD::S(B)
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