MESON Chess Problem Database

Problem Display
PID: 201491 (B1Q5/1rP4K/b3N3/1pN1pk2/2Pp1p1p/4bn2/8/8 w - - 0 1)

Pater, Karl

L'Alfiere di Re, 1922

B1Q5/1rP4K/b3N3/1pN1pk2/2Pp1p1p/4bn2/8/8

#2

7 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qf8#
  • Tries
    • 1.Sxd4+?
      • 1...Kg5
        • 2.Qf5#
      • 1...Kf6!
    • 1.Sg7+?
      • 1...Kg5
        • 2.Se4#
        • 2.Qf5#
      • 1...Kf6!
  • Keys
    • 1.Se4!
      • threat
        • 2.S6c5#
        • 2.S6g5#
      • 1...Rxc7+
        • 2.Sg7#
      • 1...Sg5+
        • 2.S6xg5#
      • 1...Kxe4
        • 2.Sc5#
      • 1...Kg4
        • 2.Sg7#
      • 1...Rb6
        • 2.Sxd4#
        • 2.Sg7#
      • 1...Ra7
        • 2.Sxd4#
        • 2.Sg7#
      • 1...Rb8
        • 2.Sxd4#
        • 2.Sg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(h);P-FLIGHT::QAR2(G)
  • Tries
    • Try
      • S(C);CHECK,XP(c)
      • Vars
        • K(h);P-FLIGHT::QAR1(G)
      • Refutation
        • K(h);P-FLIGHT
    • Try
      • S(C);CHECK,N_SPINP(D)
      • Refutation
        • K(h);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • DUALS(2)
    • Vars
      • R(j);CHECK,XP(D)::QAB(G)+S(C),DCHECK
      • S(b);CHECK::QAB(G)+S(C),XS(b)
      • K(h);P_SPINR(j),S_FLIGHT,XS(B)::S(C)
      • K(h);S_FLIGHT::QAB(G)+S(C)
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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).