MESON Chess Problem Database

Problem Display
PID: 21355 (1Q3r2/5n2/7B/3R2pp/2P1k3/5r1P/2Pb2K1/5N1B w - - 0 1)

Keysor, William Ellis

Good Companions (May), 1918

1Q3r2/5n2/7B/3R2pp/2P1k3/5r1P/2Pb2K1/5N1B

#2

9 + 7

3132 The Good Companion Two-Mover 1922

SOLUTION

  • SOUND
  • Sets
    • 1...Rf2+
      • 2.Kxf2#
    • 1...Rd3
      • 2.cxd3#
    • 1...Re3
      • 2.Sxd2#
    • 1...Rg3+
      • 2.Kxg3#
    • 1...Rxh3
      • 2.Kxh3#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sxh6
      • 2.Qe5#
    • 1...Sd8
      • 2.Qe5#
    • 1...Sh8
      • 2.Qe5#
    • 1...g4
      • 2.Sxd2#
  • Tries
    • 1.Sg3+?
      • 1...Ke3
        • 2.Rd3#
      • 1...Rxg3+!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qxf3#
      • 1...Rf2+
        • 2.Kxf2#
      • 1...Rxg3+
        • 2.Kxg3#
      • 1...Rxf1
        • 2.Kxf1#
      • 1...Sxh6
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Ra3
        • 2.Sxd2#
      • 1...Rb3
        • 2.Sxd2#
      • 1...Rc3
        • 2.Sxd2#
      • 1...Rd3
        • 2.cxd3#
      • 1...Re3
        • 2.Sxd2#
      • 1...Rf4
        • 2.Sxd2#
        • 2.Qd3#
      • 1...Rf5
        • 2.Sxd2#
      • 1...Rf6
        • 2.Sxd2#
      • 1...Sd6
        • 2.Qe5#
      • 1...Sd8
        • 2.Qe5#
      • 1...Sh8
        • 2.Qe5#
      • 1...g4
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • R(b);CHECK::B(B)+K(D),XR(b)
    • R(b);OGATE::P(C),XR(b)
    • R(b);SBLOCK::S(A),XB(a)
    • R(b);XP(E)::B(B)+K(D),XR(b)
    • S(f);N_GUARD::QAR1(I),XS(f)
    • S(f);N_GUARD,XB(H)::QAR1(I)
    • S(f);N_GUARD::QAR1(I)
    • P(d);::S(A),XB(a)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINP(d)::R1(G)
      • Refutation
        • R(b);CHECK,XS(A)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XR(b)
    • Vars
      • R(b);CHECK::B(B)+K(D),XR(b)
      • R(b);CHECK,XQ(I)::B(B)+K(D),XR(b)
      • R(b);XS(A)::B(B)+K(D),XR(b)
      • S(f);N_GUARD,XB(H)::QAR1(I)
      • S(f);N_GUARD::QAR1(I),XS(f)
      • R(b);::S(A),XB(a)
      • R(b);OGATE::P(C),XR(b)
      • S(f);N_GUARD::QAR1(I)
      • P(d);::S(A),XB(a)
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