MESON Chess Problem Database

Problem Display
PID: 250270 (3nRK2/4P2B/R1q1k3/2b5/6N1/4p3/1B6/3Q3b w - - 0 1)

Isaev, Leonid Antonovich

4th HM., Magyar Sakkvilag, 1927

3nRK2/4P2B/R1q1k3/2b5/6N1/4p3/1B6/3Q3b

#2

8 + 6

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.exd8Q#
      • 2.exd8R#
    • 1...Bb6
      • 2.exd8S#
    • 1...Ba7
      • 2.exd8Q#
      • 2.exd8S#
      • 2.exd8B#
      • 2.exd8R#
    • 1...Bxe7+
      • 2.Rxe7#
  • Tries
    • 1.Sxe3?
      • threat
        • 2.Bf5#
      • 1...Bxe7+
        • 2.Rxe7#
      • 1...Bxe3
        • 2.exd8Q#
        • 2.exd8S#
        • 2.exd8B#
        • 2.exd8R#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Bd4
        • 2.exd8Q#
      • 1...Be4!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Qd7#
      • 1...Bxe7+
        • 2.Rxe7#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Bd4
        • 2.exd8Q#
      • 1...Qd6
        • 2.Qg4#
      • 1...Bb6
        • 2.exd8S#
      • 1...Bd6
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(c);N_PINP(E)::PXS(f)=Q
    • B(c);N_PINP(E),N_SPINQ(d)::PXS(f)=S
    • B(c);CHECK,OGATE,P_SPINB(c),XP(E)::R1(G),XB(c)
  • Tries
    • Try
      • S(C);XP(b)
      • Threat
        • B(F)
      • Vars
        • B(c);CHECK,OGATE,P_SPINB(c),XP(E)::R1(G),XB(c)
        • B(a);N_GUARD::QAB1(A),XB(a)
        • B(c);N_PINP(E)::PXS(f)=Q
      • Refutation
        • B(a);
  • Actual
    • S(C);
    • Threat
      • QAB1(A)
    • Vars
      • B(c);CHECK,OGATE,P_SPINB(c),XP(E)::R1(G),XB(c)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • B(c);N_PINP(E)::PXS(f)=Q
      • Q(d);::QAB(A)
      • B(c);N_PINP(E),N_SPINQ(d)::PXS(f)=S
      • B(c);N_SPINQ(d),SBLOCK::QAB(A)
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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).