MESON Chess Problem Database

Problem Display
PID: 64407 (b3K3/1BP1R2p/2n2P2/3nBp2/1rP1kP1r/1pPR4/1N4p1/2Q3b1 w - - 0 1)

Janet, Frank

1st Prize, Good Companions (May), 1919

b3K3/1BP1R2p/2n2P2/3nBp2/1rP1kP1r/1pPR4/1N4p1/2Q3b1

#2

12 + 11

3132 The Good Companion Two-Mover 1922
3391 Het Half Pin Thema 1924
56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc3
      • 2.Bxc3#
      • 2.Bd4#
      • 2.Bd6#
    • 1...Sxf4
      • 2.Bxf4#
    • 1...Sb6
      • 2.Bd4#
      • 2.Bd6#
    • 1...Sxf6+
      • 2.Bxf6#
    • 1...Sxc7+
      • 2.Bxc7#
    • 1...Sd4
      • 2.Bxd4#
    • 1...Sa5
      • 2.Bd4#
      • 2.Bd6#
    • 1...Sxe5
      • 2.Rxe5#
    • 1...Sa7
      • 2.Bd4#
      • 2.Bd6#
    • 1...Sb8
      • 2.Bd4#
      • 2.Bd6#
  • Tries
    • 1.Rh3?
      • threat
        • 2.Qb1#
      • 1...Sxf6+
        • 2.Bxf6#
      • 1...Sxc7+
        • 2.Bxc7#
      • 1...Sxc3
        • 2.Bxc3#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Sxe5
        • 2.Rxe5#
      • 1...Se3
        • 2.Bd6#
      • 1...Sd4
        • 2.Bxd4#
      • 1...Rxh3!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Qb1#
      • 1...Sxf6+
        • 2.Bxf6#
      • 1...Sxc7+
        • 2.Bxc7#
      • 1...Sxc3
        • 2.Bxc3#
      • 1...Sxf4
        • 2.Bxf4#
      • 1...Sxe5
        • 2.Rxe5#
      • 1...Se3
        • 2.Bd6#
      • 1...Sd4
        • 2.Bxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(g);OGATE,P_SPINS(i),XP(F)::R(K)+B(G),XS(g)
    • S(g);CHECK,OGATE,P_SPINS(i),XP(H)::R(K)+B(G),XS(g)
    • S(g);CHECK,OGATE,P_SPINS(i),XP(J)::R(K)+B(G),XS(g)
    • S(i);N_GUARD,P_SPINS(g)::R(K)+B(G),XS(i)
    • S(i);OGATE,P_SPINS(g),XB(G)::R1(K),XS(i)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAB(A)
      • Vars
        • S(g);CHECK,OGATE,P_SPINS(i),XP(H)::R(K)+B(G),XS(g)
        • S(g);CHECK,OGATE,P_SPINS(i),XP(J)::R(K)+B(G),XS(g)
        • S(g);OGATE,P_SPINS(i),XP(C)::R(K)+B(G),XS(g)
        • S(g);OGATE,P_SPINS(i),XP(F)::R(K)+B(G),XS(g)
        • S(i);OGATE,P_SPINS(g),XB(G)::R1(K),XS(i)
        • S(g);N_GUARD,P_SPINS(i)::R(K)+B(G)
        • S(i);N_GUARD,P_SPINS(g)::R(K)+B(G),XS(i)
      • Refutation
        • R(f);XR(D)
  • Actual
    • R(D);
    • Threat
      • QAB(A)
    • Vars
      • S(g);CHECK,OGATE,P_SPINS(i),XP(H)::R(K)+B(G),XS(g)
      • S(g);CHECK,OGATE,P_SPINS(i),XP(J)::R(K)+B(G),XS(g)
      • S(g);OGATE,P_SPINS(i),XP(C)::R(K)+B(G),XS(g)
      • S(g);OGATE,P_SPINS(i),XP(F)::R(K)+B(G),XS(g)
      • S(i);OGATE,P_SPINS(g),XB(G)::R1(K),XS(i)
      • S(g);N_GUARD,P_SPINS(i)::R(K)+B(G)
      • S(i);N_GUARD,P_SPINS(g)::R(K)+B(G),XS(i)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).