MESON Chess Problem Database

Problem Display
PID: 198714 (1B6/2pq2R1/8/1p1p4/4pkNN/2R3p1/8/2K5 w - - 0 1)

Foschini, Ettore

L'Alfiere di Re, 1921

1B6/2pq2R1/8/1p1p4/4pkNN/2R3p1/8/2K5

#2

6 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg4
      • 2.Bxc7#
    • 1...Qf5
      • 2.Sg2#
  • Tries
    • 1.Bxc7+?
      • 1...Qd6
        • 2.Bxd6#
      • 1...Qxc7!
  • Keys
    • 1.Rxc7!
      • threat
        • 2.Rcxd7#
      • 1...Qc6+
        • 2.Rxc6#
      • 1...Qxc7+
        • 2.Bxc7#
      • 1...Qxg4
        • 2.Rc3#
      • 1...Qxg7
        • 2.Rxg7#
      • 1...e3
        • 2.Rc4#
      • 1...Qf5
        • 2.Rcf7#
      • 1...Qe6
        • 2.Rcf7#
      • 1...Qc8
        • 2.Rxc8#
      • 1...Qe8
        • 2.Rcf7#
      • 1...Qd6
        • 2.Rcf7#
      • 1...Qe7
        • 2.Rcxe7#
      • 1...Qf7
        • 2.Rd7#
        • 2.Re7#
        • 2.Rcxf7#
      • 1...Qd8
        • 2.Rcf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • Q(g);N_GUARD,XS(C)::B(F),XP(f)
    • Q(g);SBLOCK::S(D)
  • Tries
    • Try
      • B(F);CHECK,XP(f)
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::B(F),XQ(g)
      • Refutation
        • Q(g);P_PINR(B),XB(F)
  • Actual
    • R(B);XP(f)
    • Threat
      • B(F)+R(B),XQ(g)
    • Vars
      • Q(g);CHECK,N_GUARD::B(F)+R(B),XQ(g)
      • Q(g);CHECK,OGATE,P_SPINQ(g),XR(B)::B(F),XQ(g)
      • Q(g);N_GUARD,XS(C)::B(F)+R(B)
      • Q(g);OGATE,XR(E)::B(F)+R(B),XQ(g)
      • P(b);::B(F)+R(B),DCHECK
      • Q(g);OGATE::B(F)+R(B)
      • Q(g);OGATE::B(F)+R(B),DCHECK
      • Q(g);N_GUARD,P_PINR(B)::B(F)+R(B),XQ(g)
      • Q(g);OGATE::R(B)
      • Q(g);OGATE::B(F)+R(B),XQ(g)
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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).