MESON Chess Problem Database

Problem Display
PID: 189791 (4QK2/8/N1R1P2p/P2kP2P/3n2P1/1n3P2/8/B7 w - - 0 1)

Zalkind, Lazar Borissovich

Shakhmatny Vestnik, 1912

4QK2/8/N1R1P2p/P2kP2P/3n2P1/1n3P2/8/B7

#2

11 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sxa1
      • 2.Rc5#
    • 1...Sc1
      • 2.Rc5#
    • 1...Sd2
      • 2.Rc5#
    • 1...Sxa5
      • 2.Rc5#
    • 1...Sc5
      • 2.Rxc5#
    • 1...Sc2
      • 2.Sc7#
      • 2.Qd7#
    • 1...Se2
      • 2.Sb4#
      • 2.Sc7#
      • 2.Qd7#
    • 1...Sb5
      • 2.Sb4#
    • 1...Sf5
      • 2.Sb4#
      • 2.Sc7#
    • 1...Sxe6+
      • 2.Qxe6#
  • Tries
    • 1.Qd8+?
      • 1...Kxc6
        • 2.Qd7#
      • 1...Kxe5!
  • Keys
    • 1.Qf7!
      • 1...Sxe6+
        • 2.Qxe6#
      • 1...Kxe5
        • 2.Qf5#
      • 1...Kxc6
        • 2.Qd7#
      • 1...Sxa1
        • 2.Rc5#
      • 1...Sxa5
        • 2.Rc5#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...Sxc6
        • 2.e7#
      • 1...Sc5
        • 2.Rxc5#
      • 1...Sc1
        • 2.Rc5#
      • 1...Sd2
        • 2.Rc5#
      • 1...Sc2
        • 2.Qd7#
      • 1...Se2
        • 2.Sb4#
        • 2.Qd7#
      • 1...Sb5
        • 2.Sb4#
      • 1...Sf5
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD,XB(A)::R1(H)
    • S(a);N_GUARD::R1(H)
    • S(a);N_GUARD,XP(D)::R1(H)
    • S(a);N_GUARD::R1(H),XS(a)
    • S(b);::S(G)
    • S(b);CHECK,OGATE,XP(I)::QAB1(J),XS(b)
  • Tries
    • Try
      • Q(J);CHECK
      • Vars
        • K(c);S_FLIGHT,XR(H)::QAB1(J)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(b),XP(E)
  • Actual
    • Q(J);
    • Vars
      • S(b);CHECK,OGATE,P_SPINS(b),XP(I)::QAB1(J),XS(b)
      • K(c);OGATEB,P-FLIGHT,P_SPINS(b),XP(E)::QAR1(J)
      • K(c);S_FLIGHT,XR(H)::QAB1(J)
      • S(a);N_GUARD,XB(A)::R1(H)
      • S(a);N_GUARD,XP(D)::R1(H)
      • S(b);OGATE,XP(B)::QAB(J),XS(b)
      • S(b);N_GUARD,SBLOCK,XR(H)::QAB(J)+P(I)
      • S(a);N_GUARD::R1(H),XS(a)
      • S(a);N_GUARD::R1(H)
      • S(b);::QAR2(J)
      • S(b);::S(G)
HTML5 logo

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).