MESON Chess Problem Database

Problem Display
PID: 83543 (8/7B/7K/1R6/2pk1pP1/R3q3/3b1B1Q/6nb w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1920

8/7B/7K/1R6/2pk1pP1/R3q3/3b1B1Q/6nb

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Qxf4#
    • 1...c3
      • 2.Ra4#
    • 1...f3+
      • 2.Qf4#
  • Tries
    • 1.Bxe3+?
      • 1...fxe3
        • 2.Qe5#
      • 1...Bxe3!
    • 1.Qh5?
      • threat
        • 2.Qc5#
        • 2.Qe5#
      • 1...c3
        • 2.Ra4#
        • 2.Rb4#
        • 2.Qc5#
      • 1...Bd5
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Bb4
        • 2.Qe5#
      • 1...Sf3
        • 2.Rd5#
        • 2.Qc5#
        • 2.Qd5#
      • 1...f3+!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf6#
      • 1...f3+
        • 2.g5#
      • 1...c3
        • 2.Ra4#
      • 1...Sf3
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);S_CUTB(b)::QAR2(B),XP(g)
    • P(e);OGATEB,SBLOCK::R(C)
    • P(g);CHECK,S_CUTB(b)::QAR2(B)
  • Tries
    • Try
      • B(A);CHECK,XQ(d)
      • Vars
        • P(g);OGATE,XB(A)::QAB1(B)
      • Refutation
        • B(c);XB(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(c);::QAB1(B)
      • Refutation
        • P(g);CHECK
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • P(g);CHECK::QAR(B)+P(D)
      • P(e);OGATEB,SBLOCK::R(C)
      • S(a);S_CUTB(b)::QAR(B)
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).