MESON Chess Problem Database

Problem Display
PID: 108468 (b6B/3N3B/8/pR3PRp/K2Pk3/2p1qpP1/8/4N1Q1 w - - 0 1)

Isaev, Leonid Antonovich

Shakhmatny Listok, 1928

b6B/3N3B/8/pR3PRp/K2Pk3/2p1qpP1/8/4N1Q1

#2

11 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Sf6#
      • 2.Re5#
      • 2.f6#
    • 1...Qd2
      • 2.Sf6#
      • 2.Re5#
      • 2.f6#
    • 1...Qxd4+
      • 2.Qxd4#
    • 1...Qf4
      • 2.Sf6#
    • 1...Qxg5
      • 2.Re5#
    • 1...Qxe1
      • 2.f6#
    • 1...Qe2
      • 2.Sf6#
      • 2.Re5#
      • 2.f6#
    • 1...Qd3
      • 2.Sf6#
      • 2.Re5#
      • 2.f6#
    • 1...Bd5
      • 2.Sc5#
  • Tries
    • 1.Rg4+?
      • 1...Qf4
        • 2.Sf6#
        • 2.Rxf4#
        • 2.Re5#
        • 2.f6#
      • 1...hxg4!
  • Keys
    • 1.Rg8!
      • threat
        • 2.Re8#
      • 1...Qxd4+
        • 2.Qxd4#
      • 1...Qxe1
        • 2.f6#
      • 1...Qf4
        • 2.Sf6#
      • 1...Qg5
        • 2.Re5#
      • 1...Qh6
        • 2.Re5#
      • 1...Bd5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,XP(E)::QAR1(B),XQ(b)
    • Q(b);::S(I)
    • Q(b);XR(H)::R1(F)
    • Q(b);XS(A)::B(J)+P(G)
    • B(g);SBLOCK::S(I)
  • Tries
    • Try
      • R(H);CHECK
      • Refutation
        • P(f);XR(H)
  • Actual
    • R(H);
    • Threat
      • R(H)
    • Vars
      • Q(b);CHECK,OGATE,XP(E)::QAR1(B),XQ(b)
      • Q(b);XS(A)::B(J)+P(G)
      • Q(b);::S(I)
      • Q(b);::R1(F)
      • B(g);SBLOCK::S(I)
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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).