MESON Chess Problem Database

Problem Display
PID: 21635 (B3Rbq1/4p3/4pB2/pN1p1NP1/4kppR/Q7/4P2K/1b6 w - - 0 1)

Sheppard, Charles William

Good Companions (December), 1920

B3Rbq1/4p3/4pB2/pN1p1NP1/4kppR/Q7/4P2K/1b6

#2

10 + 10

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Qd3#
    • 1...Bd3
      • 2.Qxd3#
    • 1...f3
      • 2.Qxf3#
    • 1...g3+
      • 2.Sxg3#
    • 1...exf5
      • 2.Sd6#
  • Tries
    • 1.Qb4+?
      • 1...Kxf5
        • 2.Qxb1#
      • 1...axb4!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Qxb1#
      • 1...g3+
        • 2.Sxg3#
      • 1...Kxf5
        • 2.Qxb1#
      • 1...exf5
        • 2.Sd6#
      • 1...exf6
        • 2.Qxd5#
      • 1...f3
        • 2.Qxf3#
      • 1...Ba2
        • 2.Qc2#
        • 2.Qd3#
      • 1...Bc2
        • 2.Qxc2#
      • 1...Bd3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAB1(C)
    • B(a);N_GUARD::QAB1(C),XB(a)
    • P(c);N_SPINP(f),P_SPINP(d)::QAB1(C),XP(c)
    • P(d);CHECK,N_SPINP(f),P_SPINP(c)::S(F),XP(d)
    • P(g);S_CUTP(h),XS(F)::S(E)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_SPINP(f),S_FLIGHT,XS(F)::QAB(C),XB(a)
      • Refutation
        • P(e);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C),XB(a)
    • Vars
      • P(d);CHECK,N_SPINP(f),P_SPINP(c)::S(F),XP(d)
      • K(b);N_SPINP(f),S_FLIGHT,XS(F)::QAB(C),XB(a)
      • P(g);S_CUTP(h),XS(F)::S(E)
      • P(h);S_CUTP(g),XB(H)::QAB1(C),XP(f)
      • P(c);N_SPINP(f),P_SPINP(d)::QAB1(C),XP(c)
      • B(a);N_GUARD::QAB(C),XB(a)
      • B(a);N_GUARD::QAB1(C),XB(a)
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