MESON Chess Problem Database

Problem Display
PID: 64671 (1QB5/1pK2N2/7B/2pp1Pbr/R1n1nk2/5Pp1/1rP1PPR1/3N4 w - - 0 1)

Ellerman, Arnoldo

3rd Prize, Good Companions (May), 1921

1QB5/1pK2N2/7B/2pp1Pbr/R1n1nk2/5Pp1/1rP1PPR1/3N4

#2

13 + 10

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

SOLUTION

  • SOUND
  • Sets
    • 1...Scd2
      • 2.fxg3#
    • 1...Sa3
      • 2.fxg3#
    • 1...Se3
      • 2.fxe3#
      • 2.fxg3#
    • 1...Sa5
      • 2.fxg3#
    • 1...Se5
      • 2.fxg3#
    • 1...Sb6
      • 2.Kxb7#
      • 2.fxg3#
    • 1...Scd6
      • 2.fxg3#
    • 1...Sed2
      • 2.fxg3#
    • 1...Sc3
      • 2.fxg3#
    • 1...Sed6
      • 2.fxg3#
    • 1...Sf6
      • 2.Kd8#
      • 2.fxg3#
    • 1...gxf2
      • 2.Rg4#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Sxd5#
      • 1...Se3
        • 2.fxg3#
      • 1...Sb6
        • 2.Kxb7#
      • 1...Sf6
        • 2.Kd8#
      • 1...d4
        • 2.Sd5#
      • 1...Sxc3!
    • 1.Bxg5+?
      • 1...Sxg5
        • 2.Kd8#
        • 2.fxg3#
      • 1...Rxg5!
  • Keys
    • 1.Se3!
      • threat
        • 2.Sxd5#
      • 1...Sxe3
        • 2.fxg3#
      • 1...Sb6
        • 2.Kxb7#
      • 1...Sc3
        • 2.Kd7#
      • 1...Sf6
        • 2.Kd8#
      • 1...d4
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • S(c);P_SPINS(d)::P(D),XP(b)
    • S(d);N_GUARD,P_SPINS(c)::P(D),XP(b)
    • P(b);OGATE,XP(D)::R1(E)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A),XP(g)
      • Vars
        • S(c);P_SPINS(d),SBLOCK::P(D),XP(b)
        • S(c);P_SPINS(d)::QAB(L)+K(J),XP(j)
        • S(d);P_SPINS(c)::QAB(L)+K(J)
        • P(g);::S(A)
      • Refutation
        • S(d);P_SPINS(c),XS(A)
    • Try
      • B(I);CHECK,XB(h)
      • Refutation
        • R(i);XB(I)
  • Actual
    • S(A);
    • Threat
      • S(A),XP(g)
    • Vars
      • S(c);P_SPINS(d),SBLOCK,XS(A)::P(D),XP(b)
      • S(c);P_SPINS(d)::QAB(L)+K(J),XP(j)
      • S(d);N_GUARD,P_SPINS(c)::QAB(L)+K(J)
      • S(d);P_SPINS(c)::QAB(L)+K(J)
      • P(g);::S(A)
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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).