MESON Chess Problem Database

Problem Display
PID: 12199 (4N3/4p2Q/1Nn1kPP1/4n1P1/K3pRq1/5p1B/3B2p1/4R1r1 w - - 0 1)

Lender, Baruch

1st Comm., Israel Ring Ty., 1976

4N3/4p2Q/1Nn1kPP1/4n1P1/K3pRq1/5p1B/3B2p1/4R1r1

#2

11 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Bxf5#
    • 1...Sb4
      • 2.Qxe7#
    • 1...Sd4
      • 2.Qxe7#
    • 1...Sa5
      • 2.Qxe7#
    • 1...Sa7
      • 2.Qxe7#
    • 1...Sb8
      • 2.Qxe7#
    • 1...Sd8
      • 2.Qxe7#
    • 1...exf6
      • 2.Rxf6#
  • Tries
    • 1.Rexe4?
      • threat
        • 2.Bxg4#
        • 2.Qg8#
        • 2.Qf7#
      • 1...Qxh3
        • 2.Qg8#
        • 2.Qxh3#
        • 2.Qf7#
      • 1...exf6
        • 2.Rxf6#
        • 2.Qd7#
        • 2.Qf7#
      • 1...Qf5
        • 2.Bxf5#
        • 2.Qg8#
        • 2.Qf7#
      • 1...Sd4
        • 2.Qg8#
        • 2.Qxe7#
        • 2.Qf7#
      • 1...Sd8
        • 2.Bxg4#
        • 2.Qxe7#
      • 1...Ra1+!
  • Keys
    • 1.Rfxe4!
      • threat
        • 2.Bxg4#
      • 1...Kf5
        • 2.Sg7#
      • 1...Qxh3
        • 2.Qxh3#
      • 1...exf6
        • 2.Qd7#
      • 1...Qf5
        • 2.Qg8#
        • 2.Qf7#
      • 1...Sd4
        • 2.Rxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(e);OGATE::B(C),XQ(e)
    • S(g);N_GUARD::QAR1(J),XP(i)
    • P(i);OGATE,XP(H)::R1(E),XP(i)
  • Tries
    • Try
      • R(A);P_PINS(f),XP(d)
      • Threat
        • DUALS(3)
      • Refutation
        • R(a);CHECK
  • Actual
    • R(E);P_PINS(f),P_SPINR(E),XP(d)
    • Threat
      • B(C),XQ(e)
    • Vars
      • K(h);N_SPINS(f),S_FLIGHT::S(K)
      • Q(e);N_PINR(E),N_SPINQ(e),OGATE,XB(C)::QAB(J),XQ(e)
      • P(i);OGATE,XP(H)::QAB1(J)
      • S(g);N_PINR(E)::R1(E),XS(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).