MESON Chess Problem Database

Problem Display
PID: 227536 (4B2b/2K1p1q1/1PN1p1p1/3kn1Q1/R4Pp1/5pN1/4PB2/1b6 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Els Escacs a Catalunya, 1926

4B2b/2K1p1q1/1PN1p1p1/3kn1Q1/R4Pp1/5pN1/4PB2/1b6

#2

10 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh6
      • 2.Sxe7#
    • 1...Qg8
      • 2.Sxe7#
    • 1...Ba2
      • 2.e4#
  • Tries
    • 1.Sxe5?
      • threat
        • 2.Bc6#
        • 2.Ra5#
      • 1...Bd3
        • 2.Bc6#
      • 1...Qxe5+!
  • Keys
    • 1.Qxe7!
      • threat
        • 2.Rd4#
      • 1...Qxe7+
        • 2.Sxe7#
      • 1...Sxc6
        • 2.Bxc6#
      • 1...Sd3
        • 2.e4#
      • 1...Sc4
        • 2.Sb4#
      • 1...Sd7
        • 2.Qd6#
      • 1...Sf7
        • 2.Qc5#

There are these versions: 269333

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(i);N_GUARD::S(H),XP(h)
    • B(a);N_GUARD::P(A)
  • Tries
    • Try
      • S(H);XS(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::B(J)
      • Refutation
        • Q(i);CHECK,P_SPINQ(i),XS(H)
  • Actual
    • Q(F);N_PINS(e),P_SPINQ(F),XP(h)
    • Threat
      • R1(D)
    • Vars
      • Q(i);CHECK,XQ(F)::S(H),XQ(i)
      • S(e);OGATE,XS(H)::B(J),XS(e)
      • S(e);S_CUTB(a)::P(A)
      • S(e);SBLOCK::S(H)
      • S(e);N_PINQ(F)::QAR1(F)
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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).