MESON Chess Problem Database

Problem Display
PID: 21526 (8/4Kp2/B2Q2R1/4PN2/1p1B4/b7/1p2b1Pp/1R2nk1q w - - 0 1)

Sparke, Arthur M

Good Companions (November), 1919

8/4Kp2/B2Q2R1/4PN2/1p1B4/b7/1p2b1Pp/1R2nk1q

#2

9 + 9

3132 The Good Companion Two-Mover 1922
4035 Aarsskrift for DSK 1934

SOLUTION

  • SOUND
  • Sets
    • 1...Bd3
      • 2.Bxd3#
    • 1...Bc4
      • 2.Bxc4#
    • 1...Bb5
      • 2.Bxb5#
    • 1...Bxa6
      • 2.Qxa6#
  • Tries
    • 1.Bb7?
      • threat
        • 2.Sg3#
      • 1...Qxg2
        • 2.Bxg2#
      • 1...Bf3!
    • 1.Qd5?
      • threat
        • 2.Sg3#
        • 2.Qf3#
      • 1...Qxg2
        • 2.Qxg2#
      • 1...Qg1
        • 2.Sg3#
      • 1...b3+!
    • 1.Qc6?
      • threat
        • 2.Sg3#
        • 2.Qf3#
      • 1...Qxg2
        • 2.Qxg2#
      • 1...Qg1
        • 2.Sg3#
      • 1...b3+!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Sh4#
        • 2.Sd6#
        • 2.Sh6#
        • 2.Sg7#
      • 1...b3+
        • 2.Sd6#
      • 1...Qxg2
        • 2.Sg3#
      • 1...Bxa6
        • 2.Qxa6#
      • 1...fxg6
        • 2.Sh4#
      • 1...Bd3
        • 2.Bxd3#
      • 1...Bc4
        • 2.Bxc4#
      • 1...Bb5
        • 2.Bxb5#
      • 1...Qg1
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(e);OGATEB::B(F),XB(e)
    • B(e);N_SPINB(e),OGATE,XB(F)::QAB(G),XB(e)
  • Tries
    • Try
      • B(F);N_PINB(e)
      • Threat
        • S(E)
      • Vars
        • Q(c);OGATE,XP(B)::B(F),XQ(c)
      • Refutation
        • B(e);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);OGATE,XP(B)::QAB1(G),XQ(c)
        • Q(c);::S(E)
      • Refutation
        • P(h);CHECK
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);OGATE,XP(B)::QAB1(G),XQ(c)
        • Q(c);::S(E)
      • Refutation
        • P(h);CHECK
  • Actual
    • Q(G);
    • Threat
      • DUALS(4)
    • Vars
      • P(h);CHECK::QAR(G)+S(E)
      • Q(c);SBLOCK,XP(B)::QAR(G)+S(E),DCHECK
      • B(e);N_SPINB(e),OGATE,XB(F)::QAB(G),XB(e)
      • P(i);XR(H)::QAR(G)+S(E)
      • B(e);OGATEB::B(F),XB(e)
      • Q(c);SBLOCK::QAR(G)+S(E),DCHECK
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