MESON Chess Problem Database

Problem Display
PID: 21338 (1q3RB1/1pB5/1r1rNRp1/Q2bk1p1/2p5/1p3p2/4nN2/3K4 w - - 0 1)

Wilson, Francis Vaux

Good Companions (January black Bishop), 1918

1q3RB1/1pB5/1r1rNRp1/Q2bk1p1/2p5/1p3p2/4nN2/3K4

#2

8 + 12

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Sc1
      • 2.Qc3#
    • 1...Sg1
      • 2.Qc3#
    • 1...Sc3+
      • 2.Qxc3#
    • 1...Sg3
      • 2.Qc3#
    • 1...Sf4
      • 2.Qc3#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Sg4#
        • 2.Re4#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Qxf8
        • 2.Sg4#
      • 1...Sxf4
        • 2.Qc3#
      • 1...Rb5
        • 2.Sg4#
      • 1...Sg3
        • 2.Sg4#
        • 2.Qc3#
      • 1...g4
        • 2.Sxg4#
        • 2.Re4#
      • 1...gxf4!
    • 1.Qc3+?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sxc3+!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxg5#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Bxe6
        • 2.Rxe6#
      • 1...Be4
        • 2.Sg4#
      • 1...Bc6
        • 2.Qxd6#
      • 1...Sg3
        • 2.Qc3#
        • 2.Qd4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sf4
        • 2.Qc3#
        • 2.Qd4#
      • 1...g4
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAB(C)
    • S(a);CHECK,N_GUARD::QAB(C),XS(a)
  • Tries
    • Try
      • R(E);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);CHECK,N_GUARD::QAB(C),XS(a)
        • Q(l);XR(G)::S(B)
        • S(a);N_GUARD,XR(E)::QAB(C)
        • R(h);N_SPINB(e)::S(B)
      • Refutation
        • P(g);XR(E)
    • Try
      • Q(C);CHECK,N_PINB(e)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • S(a);CHECK,XQ(C)
  • Actual
    • Q(C);N_PINB(e)
    • Threat
      • QAR2(C),XP(g)
    • Vars
      • S(a);CHECK,N_GUARD::QAB(C),XS(a)
      • B(e);OGATE,P_PINQ(C),XS(D)::R1(E),XB(e)
      • B(e);P_PINQ(C),SBLOCK::S(B)
      • B(e);OGATE,P_PINQ(C)::QAB1(C),XR(i)
      • S(a);N_GUARD::QAB1(C),XS(a)
      • P(g);::QAR2(C)
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