MESON Chess Problem Database

Problem Display
PID: 180499 (3q4/pBkP1Q2/K1N1P3/1p6/b2N4/3R4/7b/8 w - - 0 1)

Lider, Valentin Viktorovich

3rd HM., Zadachi i Etyudi, 1963

3q4/pBkP1Q2/K1N1P3/1p6/b2N4/3R4/7b/8

#2

8 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.d8Q#
    • 1...Qg5
      • 2.d8Q#
    • 1...Qf6
      • 2.d8Q#
    • 1...Qe7
      • 2.d8Q#
    • 1...Qxd7
      • 2.Qxd7#
    • 1...Qa8
      • 2.d8Q#
      • 2.d8R#
    • 1...Qb8
      • 2.d8Q#
      • 2.d8R#
    • 1...Qc8
      • 2.dxc8S#
      • 2.d8Q#
    • 1...Qe8
      • 2.dxe8S#
      • 2.d8Q#
    • 1...Qf8
      • 2.d8Q#
    • 1...Qg8
      • 2.d8Q#
    • 1...Qh8
      • 2.d8Q#
      • 2.d8R#
    • 1...Bg1
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Bd1
      • 2.Sxb5#
    • 1...Bc2
      • 2.Sxb5#
    • 1...Bb3
      • 2.Sxb5#
  • Keys
    • 1.e7!
      • threat
        • 2.Se6#
      • 1...Kd6
        • 2.Se6#
      • 1...Kxd7
        • 2.exd8Q#
        • 2.exd8R#
      • 1...Qxe7
        • 2.d8Q#
      • 1...Qxd7
        • 2.e8S#
      • 1...Bd6
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Bb3
        • 2.Sxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(f);OGATE::P=Q
    • Q(f);OGATE,P_SPINQ(f),XP(G)::QAR1(H),XQ(f)
    • B(a);N_GUARD::QAB(H)
    • B(a);N_GUARD::QAB(H),XB(a)
    • B(b);N_GUARD::S(B),XP(c)
  • Actual
    • P(E);
    • Threat
      • S(B)
    • Vars
      • K(e);S_FLIGHT::R(A)+S(B)
      • K(e);P-FLIGHT,XP(G)::PXQ(f)=Q
      • Q(f);OGATE,XP(E)::P=Q
      • Q(f);N_GUARD,XP(G)::P=S
      • B(a);SBLOCK::PXQ(f)=Q
      • B(b);N_GUARD::S(B),XP(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).