MESON Chess Problem Database

Problem Display
PID: 205045 (2rr1b2/2pp1Rp1/P1k1n1R1/4QN2/8/2K2n2/2N5/6BB w - - 0 1)

Clark, Cecil Henry Douglas

The Observer, 1952

(First published on Sun Sep 28 1952)

2rr1b2/2pp1Rp1/P1k1n1R1/4QN2/8/2K2n2/2N5/6BB

#2

9 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bb4+
      • 2.Sxb4#
    • 1...Bc5
      • 2.Qxc5#
    • 1...Bd6
      • 2.Bxf3#
    • 1...Be7
      • 2.Sxe7#
    • 1...d6
      • 2.Sb4#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Qb5#
        • 2.Qd5#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Rb8
        • 2.Qd5#
      • 1...d5+!
    • 1.Ba7?
      • threat
        • 2.Scd4#
        • 2.Sfd4#
      • 1...Bb4+
        • 2.Sxb4#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bd6
        • 2.Bxf3#
      • 1...d6
        • 2.Sb4#
      • 1...d5!
    • 1.Rxe6+?
      • 1...Bd6
        • 2.Sb4#
        • 2.Se7#
        • 2.Bxf3#
        • 2.Qc5#
      • 1...d6
        • 2.Sb4#
        • 2.Bxf3#
        • 2.Qc5#
      • 1...dxe6!
    • 1.Re7?
      • threat
        • 2.Sb4#
        • 2.Qc5#
      • 1...Bxe7
        • 2.Sxe7#
      • 1...Rb8
        • 2.Qc5#
      • 1...d6
        • 2.Sb4#
      • 1...d5!
    • 1.Qe4+?
      • 1...d5
        • 2.Qa4#
      • 1...Kb5!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Scd4#
      • 1...Bb4+
        • 2.Sxb4#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Bd6
        • 2.Bxf3#
      • 1...d5
        • 2.Qa4#
      • 1...d6
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(i);CHECK,N_GUARD::S(C),XB(i)
    • B(i);N_GUARD::QAR1(E),XB(i)
    • B(i);S_CUTP(e)::B(B),XS(a)
    • B(i);N_GUARD::S(F),XB(i)
    • P(e);S_CUTB(i)::S(C)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(i);N_GUARD::QAR1(E),XB(i)
        • R(g);::QAB1(E)
      • Refutation
        • P(e);CHECK,N_SPINS(a),P_SPINS(c)
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(i);CHECK,N_GUARD::S(C),XB(i)
        • B(i);N_GUARD::QAR1(E),XB(i)
        • B(i);S_CUTP(e)::B(B),XS(a)
        • P(e);S_CUTB(i)::S(C)
      • Refutation
        • P(e);N_SPINS(a),P_SPINS(c)
    • Try
      • R(H);CHECK,XS(c)
      • Refutation
        • P(e);XR(H)
    • Try
      • R(I);
      • Threat
        • DUALS(2)
      • Vars
        • B(i);XR(I)::S(F),XB(i)
        • R(g);::QAR1(E)
        • P(e);::S(C)
      • Refutation
        • P(e);N_SPINS(a),P_SPINS(c)
    • Try
      • Q(E);CHECK,N_PINS(a),P_PINS(c)
      • Vars
        • P(e);P_SPINP(e),SBLOCK::QAB(E)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
  • Actual
    • Q(E);
    • Threat
      • S(C)
    • Vars
      • B(i);CHECK,N_GUARD::S(C),XB(i)
      • B(i);N_GUARD::QAR1(E),XB(i)
      • B(i);S_CUTP(e)::B(B),XS(a)
      • P(e);N_SPINS(a),P_SPINS(c),SBLOCK::QAB(E)
      • P(e);S_CUTB(i)::S(C)
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