MESON Chess Problem Database

Problem Display
PID: 83657 (2q5/B7/N1n1B3/1R2NP1r/2n1k3/2Pp3p/b6Q/2b4K w - - 0 1)

Ellerman, Arnoldo

Problem (Zagreb), 1952

2q5/B7/N1n1B3/1R2NP1r/2n1k3/2Pp3p/b6Q/2b4K

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5
      • 2.Bd5#
    • 1...Se3
      • 2.Sc5#
  • Tries
    • 1.Qe2+?
      • 1...Kf4
        • 2.Qg4#
      • 1...Be3
        • 2.Qf3#
      • 1...Se3
        • 2.Qf3#
      • 1...dxe2!
    • 1.Qg2+?
      • 1...Kf4
        • 2.Sxd3#
        • 2.Sg6#
        • 2.Qg4#
      • 1...hxg2+!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf3#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...S4xe5
        • 2.Sc5#
      • 1...S6xe5
        • 2.Bd5#
      • 1...Sd2
        • 2.Qe3#
      • 1...Sd4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(g);SBLOCK,XP(F)::B(H)
    • S(e);SBLOCK::S(G)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(B)
        • B(a);P_SPINB(a)::QAB1(B)
        • S(e);P_SPINS(e)::QAB1(B)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(d);CHECK,XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • R(g);OGATE,XP(F)::QAB1(B),XR(g)
      • S(e);SBLOCK,XS(E)::S(G)
      • S(h);SBLOCK,XS(E)::B(H)
      • S(e);N_GUARD,S_CUTB(a)::QAR1(B)
      • S(h);N_GUARD::QAR1(B),XS(h)
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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).