MESON Chess Problem Database

Problem Display
PID: 101186 (1K6/3B4/2P1R2B/3p1kp1/2p4p/1N2P1p1/1b3N2/5RQ1 w - - 0 1)

Petersson, Axel

Good Companions, 1921

1K6/3B4/2P1R2B/3p1kp1/2p4p/1N2P1p1/1b3N2/5RQ1

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Sd4#
    • 1...Ba3
      • 2.Sd4#
    • 1...Bd4
      • 2.Sxd4#
    • 1...Be5+
      • 2.Rd6#
    • 1...gxf2
      • 2.Rxf2#
      • 2.Qxg5#
    • 1...c3
      • 2.Sd4#
    • 1...g4
      • 2.Sd1#
      • 2.Sh1#
      • 2.Sd3#
      • 2.Sh3#
      • 2.Se4#
  • Tries
    • 1.Rg6+?
      • 1...Ke5
        • 2.Bg7#
      • 1...Kxg6!
    • 1.Qg2?
      • threat
        • 2.Qf3#
      • 1...Be5+
        • 2.Rd6#
      • 1...g4
        • 2.Sd1#
        • 2.Sh1#
        • 2.Sd3#
        • 2.Sh3#
        • 2.Se4#
      • 1...Bf6!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Qb1#
      • 1...Be5+
        • 2.Rd6#
      • 1...gxf2
        • 2.Qxg5#
      • 1...Bc1
        • 2.Sd4#
      • 1...c3
        • 2.Sd4#
      • 1...d4
        • 2.Ra5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(D)
    • B(a);N_GUARD::S(D),XB(a)
    • B(a);CHECK,SBLOCK::B(I)+R(G)
    • P(c);S_CUTB(a)::S(D)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(f);P-FLIGHT::B(H)
      • Refutation
        • K(f);S_FLIGHT,XR(G)
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • B(a);CHECK,SBLOCK::B(I)+R(G)
      • Refutation
        • B(a);
  • Actual
    • R(A);
    • Threat
      • QAB(B)
    • Vars
      • B(a);CHECK,SBLOCK::B(I)+R(G)
      • P(b);OGATE,XS(C)::QAR1(B),XP(g)
      • B(a);N_GUARD::S(D)
      • P(c);S_CUTB(a)::S(D)
      • P(e);OGATEB::R(A)
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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).