MESON Chess Problem Database

Problem Display
PID: 132136 (K2R4/b1B4B/2pN3N/1bPPP2R/3kPp2/p2ppn2/5n2/2Q5 w - - 0 1)

Casa, Alex

2nd HM., Die Schwalbe, 1953/I

K2R4/b1B4B/2pN3N/1bPPP2R/3kPp2/p2ppn2/5n2/2Q5

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Qc4#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Bxc5
      • 2.Qa1#
    • 1...Sxe4
      • 2.Sdf5#
    • 1...Sxe5
      • 2.Shf5#
    • 1...cxd5
      • 2.Sxb5#
  • Tries
    • 1.dxc6?
      • threat
        • 2.Sxb5#
        • 2.Sb7#
        • 2.Sdf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Bxc5
        • 2.Sxb5#
        • 2.Qa1#
      • 1...Sxe4
        • 2.Sxe4#
        • 2.Sxb5#
        • 2.Sdf5#
      • 1...Sxe5
        • 2.Sxb5#
        • 2.Shf5#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Ba4
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sdf7#
        • 2.Sc8#
        • 2.Se8#
        • 2.Qc4#
      • 1...Ba6
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sdf7#
        • 2.Sc8#
        • 2.Se8#
      • 1...Bxc6+!
  • Keys
    • 1.Sb7!
      • threat
        • 2.dxc6#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...Sxe4
        • 2.Sf5#
      • 1...Sxe5
        • 2.Bxe5#
      • 1...cxd5
        • 2.Rxd5#
      • 1...Bc4
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::QAR1(A)
    • B(h);N_GUARD::QAR1(A),XB(h)
    • B(j);SBLOCK,XP(C)::QAB(A)
    • S(a);SBLOCK,XP(B)::S(G)
    • S(e);SBLOCK,XP(E)::S(H)
    • P(i);N_GUARD,XP(D)::S(G),XB(h)
  • Tries
    • Try
      • P(D);XP(i)
      • Threat
        • DUALS(5)
      • Vars
        • B(h);N_GUARD::QAR1(A),XB(h)
      • Refutation
        • B(h);CHECK,XP(D)
  • Actual
    • S(G);
    • Threat
      • R(L)+P(D),XP(i)
    • Vars
      • B(j);OGATE,XP(C)::QAB1(A),XB(j)
      • S(a);SBLOCK,XP(B)::S(H)
      • S(e);OGATE,XP(E)::B(I),XS(e)
      • P(i);OGATE,P_SPINP(i),XP(D)::R1(L),XP(i)
      • B(h);SBLOCK::QAB(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).