MESON Chess Problem Database

Problem Display
PID: 139197 (b6B/3N1n1Q/8/R3P3/1P1kP1n1/1KN2q2/2PP4/4R3 w - - 0 1)

Apro, Laszlo

The Problemist, 1937

b6B/3N1n1Q/8/R3P3/1P1kP1n1/1KN2q2/2PP4/4R3

#2

12 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Sb5#
    • 1...Qh1
      • 2.Se2#
      • 2.Sb5#
    • 1...Qe2
      • 2.Sxe2#
    • 1...Qg2
      • 2.Sb5#
    • 1...Qf2
      • 2.Sb5#
    • 1...Qxc3+
      • 2.dxc3#
    • 1...Qf4
      • 2.Se2#
      • 2.Sb5#
    • 1...Qf5
      • 2.Sb5#
    • 1...Qf6
      • 2.Se2#
      • 2.Sb5#
    • 1...Bd5+
      • 2.Rxd5#
    • 1...Se3
      • 2.Sb5#
  • Keys
    • 1.Sf8!
      • threat
        • 2.Se6#
      • 1...Qxc3+
        • 2.dxc3#
      • 1...Bd5+
        • 2.Rxd5#
      • 1...Qf5
        • 2.Sb5#
      • 1...Qf6
        • 2.Se2#
      • 1...Sg5
        • 2.Qa7#
      • 1...Sd8
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_PINS(E),P_PINP(B)::S(E)
    • Q(a);N_PINS(E)::S(E),XQ(a)
    • Q(a);N_PINS(E)::S(E)
    • Q(a);CHECK,OGATE,XS(E)::P(C),XQ(a)
    • B(e);CHECK,N_GUARD::R1(H),XB(e)
    • S(c);N_PINS(E)::S(E)
  • Actual
    • S(J);
    • Threat
      • S(J)
    • Vars
      • Q(a);CHECK,OGATE,XS(E)::P(C),XQ(a)
      • B(e);CHECK,N_GUARD::R1(H),XB(e)
      • Q(a);N_PINS(E)::S(E)
      • S(d);OGATE::QAB(K)
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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).