MESON Chess Problem Database

Problem Display
PID: 83682 (1B1Q4/1KN2P2/3NP3/4kP1n/2p4P/4PP2/2r2p2/1B6 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1964

1B1Q4/1KN2P2/3NP3/4kP1n/2p4P/4PP2/2r2p2/1B6

#2

12 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Sxc4#
    • 1...Rd2
      • 2.Sxc4#
    • 1...Re2
      • 2.Sxc4#
    • 1...Sg3
      • 2.f4#
    • 1...Sf6
      • 2.f4#
    • 1...Sg7
      • 2.f4#
  • Tries
    • 1.Sxc4+?
      • 1...Kxf5
        • 2.Bxc2#
        • 2.Qg5#
      • 1...Rxc4!
    • 1.Ba7?
      • threat
        • 2.Bd4#
      • 1...Rd2
        • 2.Sxc4#
      • 1...Rb2+!
  • Keys
    • 1.Sde8!
      • threat
        • 2.Qd5#
      • 1...Rb2+
        • 2.Sb5#
      • 1...Kxf5
        • 2.Qg5#
      • 1...Rd2
        • 2.Sd5#
      • 1...Sf4
        • 2.Qf6#
      • 1...Sf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(a);N_GUARD::S(F),XP(c)
    • S(e);N_GUARD::P(C)
  • Tries
    • Try
      • S(F);CHECK,XP(c)
      • Refutation
        • R(a);XS(F)
    • Try
      • B(K);
      • Threat
        • B(K)
      • Vars
        • R(a);N_GUARD::S(F),XP(c)
      • Refutation
        • R(a);CHECK
  • Actual
    • S(F);
    • Threat
      • QAR1(L)
    • Vars
      • R(a);CHECK::B(K)+S(I)
      • K(d);OGATEB,P-FLIGHT,P_SPINR(a),XP(E)::QAR1(L)
      • R(a);::B(K)+S(I)
      • S(e);N_GUARD::QAB1(L)
      • S(e);N_GUARD::QAB1(L),XS(e)
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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).