MESON Chess Problem Database

Problem Display
PID: 21166 (2K5/4B3/8/1R6/kpQb4/3R4/n1r1r3/3B4 w - - 0 1)

O'Keefe, John James

1st Prize, Good Companions (December Meredith Ty.), 1917

2K5/4B3/8/1R6/kpQb4/3R4/n1r1r3/3B4

#2

6 + 6

3132 The Good Companion Two-Mover 1922
56 The Problemist 2005

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Bxc2#
    • 1...Re3
      • 2.Bxc2#
    • 1...Re4
      • 2.Bxc2#
    • 1...Re5
      • 2.Bxc2#
    • 1...Re6
      • 2.Bxc2#
    • 1...Rxe7
      • 2.Bxc2#
    • 1...Sc3
      • 2.Qxb4#
  • Tries
    • 1.Bd8?
      • threat
        • 2.Ra5#
      • 1...Re5
        • 2.Bxc2#
      • 1...Bb6!
    • 1.Rxb4+?
      • 1...Ka5
        • 2.Ra3#
      • 1...Sxb4!
    • 1.Rc5?
      • threat
        • 2.Qxa2#
        • 2.Qb3#
        • 2.Qb5#
        • 2.Qa6#
      • 1...Bxc5
        • 2.Qa6#
      • 1...Bc3
        • 2.Qxa2#
      • 1...Re6
        • 2.Bxc2#
        • 2.Qxa2#
        • 2.Qb3#
        • 2.Qb5#
      • 1...Bb2
        • 2.Qb3#
        • 2.Qb5#
        • 2.Qa6#
      • 1...Sc1
        • 2.Qb5#
        • 2.Qa6#
      • 1...Sc3!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Qc6#
      • 1...Bc3
        • 2.Qxa2#
      • 1...Bc5
        • 2.Qa6#
      • 1...Sc3
        • 2.Qxb4#
      • 1...Re6
        • 2.Bxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD::B(A),XR(b)
    • R(c);N_GUARD,XB(E)::B(A),XR(b)
    • S(a);N_PINQ(C)::QAR1(C),XP(e)
  • Tries
    • Try
      • B(E);
      • Threat
        • R1(D)
      • Vars
        • R(c);N_GUARD::B(A),XR(b)
      • Refutation
        • B(f);
    • Try
      • R(D);CHECK,XP(e)
      • Vars
        • K(d);N_SPINR(b),P-FLIGHT::R(B)
      • Refutation
        • S(a);P_SPINS(a),XR(D)
    • Try
      • R(D);N_SPINQ(C)
      • Threat
        • DUALS(4)
      • Vars
        • B(f);XR(D)::QAR2(C)
        • B(f);::QAR2(C),XS(a)
      • Refutation
        • S(a);
  • Actual
    • R(D);
    • Threat
      • QAB(C)
    • Vars
      • B(f);N_PINQ(C)::QAR2(C),XS(a)
      • B(f);N_PINQ(C)::QAR2(C)
      • S(a);N_PINQ(C)::QAR1(C),XP(e)
      • R(c);N_GUARD::B(A),XR(b)
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