MESON Chess Problem Database

Problem Display
PID: 101170 (4R2B/4Npqr/2PR2b1/2P1k3/2p5/2r2pKP/2n2N2/6Q1 w - - 0 1)

Opdenoordt, Joseph J

1st HM., Good Companions (October), 1916

4R2B/4Npqr/2PR2b1/2P1k3/2p5/2r2pKP/2n2N2/6Q1

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Bxf6#
    • 1...Be4+
      • 2.Sg4#
    • 1...Bf5+
      • 2.Sg6#
    • 1...f5
      • 2.Sxg6#
  • Tries
    • 1.Bxg7+?
      • 1...f6
        • 2.Bxf6#
      • 1...Rxg7!
    • 1.Rd5+?
      • 1...Kf6
        • 2.Sg8#
      • 1...Ke6!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Kg4#
      • 1...Rxh3+
        • 2.Kxh3#
      • 1...Bd3+
        • 2.Kxf3#
      • 1...Be4+
        • 2.Sg4#
      • 1...Bf5+
        • 2.Sg6#
      • 1...Bh5+
        • 2.Kh4#
      • 1...Rh4
        • 2.Kxh4#
      • 1...Se3
        • 2.Kxf3#
      • 1...f5
        • 2.Sxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(h);OGATE::B(J),XQ(h)
    • B(f);CHECK,SBLOCK::S(B)
    • B(f);CHECK,SBLOCK::R(I)+S(H),DCHECK
    • P(g);SBLOCK::R(I)+S(H),DCHECK,XB(f)
  • Tries
    • Try
      • B(J);CHECK,XQ(h)
      • Vars
        • P(g);P_SPINP(g)::B(J),XP(g)
      • Refutation
        • R(i);XB(J)
    • Try
      • R(G);CHECK
      • Vars
        • K(e);S_FLIGHT::S(H)
      • Refutation
        • K(e);N_SPINQ(h),P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+K(C)
    • Vars
      • R(i);CHECK,XP(D)::QAB(A)+K(C),XR(i)
      • B(f);CHECK::QAB(A)+K(C),XP(c)
      • B(f);CHECK,SBLOCK::S(B)
      • B(f);CHECK,SBLOCK::R(I)+S(H),DCHECK
      • B(f);CHECK::QAB(A)+K(C)
      • R(i);::QAB(A)+K(C),XR(i)
      • S(a);::QAB(A)+K(C),XP(c)
      • P(g);SBLOCK::R(I)+S(H),DCHECK,XB(f)
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).