MESON Chess Problem Database

Problem Display
PID: 254462 (8/pQ6/2npp1n1/p1Pk4/K7/1P1NPP2/b7/8 w - - 0 1)

Seidemann, Felix

Die Schwalbe, 1930

8/pQ6/2npp1n1/p1Pk4/K7/1P1NPP2/b7/8

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb3+
      • 2.Qxb3#
    • 1...dxc5
      • 2.Qd7#
    • 1...e5
      • 2.Qf7#
  • Tries
    • 1.Qc7?
      • threat
        • 2.Qxd6#
      • 1...dxc5
        • 2.Qd7#
      • 1...Bxb3+!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qc4#
      • 1...Bxb3+
        • 2.Qxb3#
      • 1...dxc5
        • 2.Qxc5#
      • 1...Sb4
        • 2.c6#
      • 1...Sd4
        • 2.e4#
      • 1...Sce5
        • 2.c6#
      • 1...Sce7
        • 2.c6#
      • 1...Sb8
        • 2.c6#
      • 1...Sd8
        • 2.c6#
      • 1...Sge5
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • B(a);CHECK,OGATE,XP(A)::QAB(G),XB(a)
    • P(e);OGATEB,XP(F)::QAR2(G)
    • P(f);OGATEB::QAB(G)
  • Tries
    • Try
      • Q(G);N_PINS(d)
      • Threat
        • QAR1(G),XP(e)
      • Vars
        • P(e);OGATEB,XP(F)::QAR2(G)
      • Refutation
        • B(a);CHECK,XP(A)
  • Actual
    • Q(G);N_PINS(d)
    • Threat
      • QAB1(G)
    • Vars
      • B(a);CHECK,OGATE,XP(A)::QAB(G),XB(a)
      • P(e);OGATE,P_SPINP(e),XP(F)::QAR1(G),XP(e)
      • S(d);OGATE::QAR(G)+P(F)
      • S(d);SBLOCK::P(C)
      • S(g);N_GUARD,SBLOCK::S(B)
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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).