MESON Chess Problem Database

Problem Display
PID: 83583 (5B2/3N1pKb/1p4Q1/1P1B3p/R1Pk2qR/p7/1P1p4/1n1N2b1 w - - 0 1)

Ellerman, Arnoldo

Chess Problem, 1922

5B2/3N1pKb/1p4Q1/1P1B3p/R1Pk2qR/p7/1P1p4/1n1N2b1

#2

11 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rxf4#
    • 1...Sc3
      • 2.bxc3#
  • Tries
    • 1.Bxf7?
      • threat
        • 2.c5#
      • 1...Qe4
        • 2.Qd6#
      • 1...Sc3
        • 2.bxc3#
      • 1...Bxg6!
  • Keys
    • 1.Be4!
      • threat
        • 2.c5#
      • 1...Qxg6+
        • 2.Bxg6#
      • 1...Qxd1
        • 2.Qxb6#
      • 1...Qxd7
        • 2.Qf6#
      • 1...Qxe4
        • 2.Qd6#
      • 1...Qe2
        • 2.Qxb6#
        • 2.Qd6#
        • 2.Qf6#
      • 1...Qe6
        • 2.Qxg1#
      • 1...Sc3
        • 2.bxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_PINQ(H),OGATE::R(E),XQ(f)
    • S(a);OGATE::P(B),XS(a)
  • Tries
    • Try
      • B(G);XP(i)
      • Threat
        • R(C)+P(D)
      • Vars
        • Q(f);N_PINQ(H)::QAR2(H)
        • S(a);OGATE::P(B),XS(a)
      • Refutation
        • B(j);XQ(H)
  • Actual
    • B(G);N_PINQ(f)
    • Threat
      • R(C)+P(D)
    • Vars
      • Q(f);CHECK,OGATE,XQ(H)::R(E)+B(G),XQ(f)
      • Q(f);N_PINQ(H),XS(A)::QAB(H),XP(h)
      • Q(f);N_PINQ(H),XS(I)::QAB(H)
      • Q(f);N_PINQ(H),P_SPINQ(f),XB(G)::QAR2(H)
      • Q(f);N_PINQ(H)::QAB(H),XB(b)
      • S(a);OGATE::P(B),XS(a)
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).