MESON Chess Problem Database

Problem Display
PID: 20933 (8/r1p2pK1/1P1Np3/3kN2R/3B4/n1p1P2B/b7/3R1Q2 w - - 0 1)

Janet, Frank

1st Prize, Good Companions (December), 1914

8/r1p2pK1/1P1Np3/3kN2R/3B4/n1p1P2B/b7/3R1Q2

#2

10 + 8

3132 The Good Companion Two-Mover 1922
887 Mate in Two Moves 1931
45 Schach 2000

SOLUTION

  • SOUND
  • Sets
    • 1...cxb6
      • 2.Bxb6#
    • 1...cxd6
      • 2.Bg2#
      • 2.Qg2#
      • 2.Qh1#
      • 2.Qf3#
    • 1...c5
      • 2.Bxc3#
  • Tries
    • 1.Sec4+?
      • 1...e5
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...f5
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Kc6!
    • 1.Sexf7+?
      • 1...e5
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Kc6!
    • 1.Sdxf7?
      • threat
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Ke4
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Bb1!
    • 1.Sc8?
      • threat
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Ke4
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Bb1!
    • 1.Se8?
      • threat
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Ke4
        • 2.Sf6#
        • 2.Bg2#
        • 2.Qg2#
        • 2.Qh1#
        • 2.Qf3#
      • 1...Bb1!
    • 1.Qb5+?
      • 1...Kxd6
        • 2.Bc5#
        • 2.Qd7#
        • 2.Qc5#
      • 1...c5
        • 2.Bxc3#
        • 2.Bxc5#
        • 2.Qc6#
        • 2.Qxc5#
      • 1...Sxb5!
  • Keys
    • 1.Qxf7!
      • threat
        • 2.Qxe6#
      • 1...Kxd6
        • 2.Qd7#
      • 1...cxb6
        • 2.Bxb6#
      • 1...cxd6
        • 2.Bg2#
      • 1...c5
        • 2.Bxc3#
      • 1...c6
        • 2.Sec4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(g);OGATE,XP(H)::R(A)+B(E),XP(g)
    • P(g);SBLOCK::R(A)+B(E),XP(c)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • S(F);CHECK,XP(h)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • S(I);XP(h)
      • Threat
        • DUALS(4)
      • Refutation
        • B(a);
    • Try
      • S(I);
      • Threat
        • DUALS(4)
      • Refutation
        • B(a);
    • Try
      • S(I);
      • Threat
        • DUALS(4)
      • Refutation
        • B(a);
    • Try
      • Q(B);CHECK
      • Refutation
        • S(b);XQ(B)
  • Actual
    • Q(B);P_PINP(e),XP(h)
    • Threat
      • QAB1(B),XP(e)
    • Vars
      • K(d);N_SPINP(e),OGATEB,P-FLIGHT,XS(I)::QAR1(B)
      • P(g);OGATE,P_PINQ(B),XP(H)::R(A)+B(E),XP(g)
      • P(g);P_PINQ(B),SBLOCK,XS(I)::B(D)
      • P(g);P_PINQ(B),SBLOCK::R(A)+B(E),XP(c)
      • P(g);P_PINQ(B),SBLOCK::R(G)+S(F)
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