MESON Chess Problem Database

Problem Display
PID: 202321 (8/8/Bp1Q1p2/1r2pK2/1Bk1Nn1R/Pp1N2R1/4r1p1/1b2q3 w - - 0 1)

Larsen, Karl Adolf Koefoed

Good Companions, 1923

8/8/Bp1Q1p2/1r2pK2/1Bk1Nn1R/Pp1N2R1/4r1p1/1b2q3

#2

9 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Sxb2#
    • 1...Re3
      • 2.Sb2#
    • 1...Rxe4
      • 2.Sb2#
    • 1...Bc2
      • 2.Sb2#
    • 1...Sxd3
      • 2.Sd2#
    • 1...Sh3
      • 2.Sd2#
    • 1...Sd5
      • 2.Sd2#
    • 1...Sh5
      • 2.Sd2#
    • 1...Se6
      • 2.Sd2#
    • 1...Sg6
      • 2.Sd2#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Bxb5#
        • 2.Qd5#
      • 1...Bxd3+
        • 2.Qxd3#
      • 1...e4+
        • 2.Bxb5#
      • 1...b2
        • 2.Qd5#
      • 1...Re4
        • 2.Sb2#
        • 2.Bxb5#
      • 1...Qxc3!
    • 1.Qd5+?
      • 1...Sxd5
        • 2.Sd2#
        • 2.Sd6#
      • 1...Kxd5!
  • Keys
    • 1.Sxf6!
      • threat
        • 2.Qd5#
      • 1...Bxd3+
        • 2.Qxd3#
      • 1...e4+
        • 2.Se5#
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Re4
        • 2.Sb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • R(c);N_GUARD::S(B),XR(c)
    • R(c);N_GUARD::S(B)
    • R(c);N_GUARD,XS(E)::S(B)
    • B(a);S_CUTR(c)::S(B)
    • S(g);XS(B)::R(F)+S(E),DCHECK
    • S(g);::R(F)+S(E),DCHECK
  • Tries
    • Try
      • S(E);P_PINS(g),P_SPINS(B)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,OGATE,XS(B)::QAB1(I),XB(a)
        • P(i);CHECK,N_PINS(B),N_SPINS(g)::B(H),XR(h)
        • P(e);::QAB1(I)
      • Refutation
        • Q(b);XS(E)
    • Try
      • Q(I);CHECK
      • Refutation
        • K(f);N_SPINR(h),S_FLIGHT,XQ(I)
  • Actual
    • S(E);P_PINS(g),P_SPINS(B),XP(k)
    • Threat
      • QAB1(I)
    • Vars
      • B(a);CHECK,OGATE,XS(B)::QAB1(I),XB(a)
      • P(i);CHECK,N_PINS(B),N_SPINS(g)::S(B)
      • Q(b);OGATE,XB(D)::QAR1(I),XQ(b)
      • R(c);N_PINS(B),N_SPINS(g)::S(B)
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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).