MESON Chess Problem Database

Problem Display
PID: 21795 (3R4/bNQ1p2B/6rn/5r2/b2B2p1/3kPpN1/1R6/1K1n4 w - - 0 1)

Sheppard, Charles William

Comm., Good Companions (December), 1921

3R4/bNQ1p2B/6rn/5r2/b2B2p1/3kPpN1/1R6/1K1n4

#2

9 + 10

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

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2+
      • 2.Qxc2#
    • 1...Bb5
      • 2.Qc2#
    • 1...Bd7
      • 2.Qc2#
    • 1...Be8
      • 2.Qc2#
    • 1...Sxb2
      • 2.Qc3#
    • 1...Sf2
      • 2.Qc3#
    • 1...Sc3+
      • 2.Qxc3#
    • 1...Sxe3
      • 2.Qc3#
  • Tries
    • 1.Bb6+?
      • 1...Rd5
        • 2.Rxd5#
      • 1...Bd7
        • 2.Qc2#
      • 1...Rd6!
    • 1.Bxa7+?
      • 1...Rd5
        • 2.Rxd5#
      • 1...Bd7
        • 2.Qc2#
      • 1...Rd6!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Rd2#
      • 1...Bc2+
        • 2.Qxc2#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxd4
        • 2.Rxd4#
      • 1...Sxb2
        • 2.Qc3#
      • 1...Rb5
        • 2.Bc5#
      • 1...Rb6
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • B(d);CHECK,N_GUARD::QAB1(G),XB(d)
    • B(d);N_GUARD::QAB1(G)
    • S(a);N_GUARD,XR(B)::QAR1(G)
    • S(a);N_GUARD::QAR1(G)
    • S(a);CHECK,N_GUARD::QAR1(G),XS(a)
    • S(a);N_GUARD,XP(C)::QAR1(G)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(I),XR(f)
        • B(d);P_SPINB(d)::QAB1(G)
      • Refutation
        • R(g);P_SPINR(f)
    • Try
      • B(E);CHECK,XB(i)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(I),XR(f)
        • B(d);P_SPINB(d)::QAB1(G)
      • Refutation
        • R(g);P_SPINR(f)
  • Actual
    • Q(G);
    • Threat
      • R1(B)
    • Vars
      • B(d);CHECK,N_GUARD::QAB1(G),XB(d)
      • S(a);CHECK,N_GUARD::QAR1(G),XS(a)
      • B(i);OGATE,P_SPINB(i),XB(E)::R1(I),XB(i)
      • S(a);N_GUARD,XR(B)::QAR1(G)
      • R(f);N_GUARD,P_PINR(B),P_SPINR(g),S_CUTB(d)::R(I)+B(E)
      • R(g);P_PINR(B),P_SPINR(f),S_CUTB(i)::S(F)
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