MESON Chess Problem Database

Problem Display
PID: 240727 (8/4K2p/1ppNBP2/b3k1n1/r1R1q1r1/3Q2P1/7R/6N1 w - - 0 1)

Larsen, Lars Aksglade (= Aksglade, Lars)

Thema Danicum, 2001

8/4K2p/1ppNBP2/b3k1n1/r1R1q1r1/3Q2P1/7R/6N1

#2

9 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Qf5#
    • 1...Qg2
      • 2.Qf5#
    • 1...Qd5
      • 2.Qf5#
    • 1...Qf5
      • 2.Qxf5#
    • 1...Qe1
      • 2.Qf5#
    • 1...Qe2
      • 2.Qf5#
    • 1...Qe3
      • 2.Qf5#
    • 1...Qd4
      • 2.Qf5#
    • 1...Sf3
      • 2.Sf7#
    • 1...Sh3
      • 2.Sf7#
    • 1...Sf7
      • 2.Sxf7#
  • Tries
    • 1.Sf3+?
      • 1...Sxf3
        • 2.Sf7#
      • 1...Qxf3!
    • 1.Rh5?
      • threat
        • 2.Sf7#
      • 1...Rxg3
        • 2.Qxe4#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qg6
        • 2.Sf3#
      • 1...Bb4!
    • 1.Qxe4+?
      • 1...Sxe4
        • 2.Sf3#
        • 2.Sf7#
      • 1...Rxe4!
  • Keys
    • 1.Re2!
      • threat
        • 2.Qd4#
      • 1...Qxe2
        • 2.Qf5#
      • 1...Rxc4
        • 2.Sxc4#
      • 1...Rxg3
        • 2.Qxg3#
      • 1...Sxe6
        • 2.Sf3#
      • 1...Qe3
        • 2.Qf5#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Sf3
        • 2.Sxf3#
        • 2.Sf7#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 9
  • Sets
    • Q(b);OGATE::QAR1(C)
    • Q(b);OGATE::QAR1(C),XQ(b)
    • S(f);N_GUARD::S(F)
    • S(f);N_GUARD::S(F),XS(f)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • S(f);XS(A)::S(F)
      • Refutation
        • Q(b);XS(A)
    • Try
      • R(B);P_PINS(f)
      • Threat
        • S(F)
      • Vars
        • R(c);N_GUARD,XP(D)::QAR1(C),XQ(b)
        • Q(b);N_SPINS(f),OGATE::QAR1(C),XQ(b)
        • Q(b);N_GUARD::S(A)
      • Refutation
        • B(d);P_PINS(F)
    • Try
      • Q(C);CHECK,XQ(b)
      • Refutation
        • R(c);XQ(C)
  • Actual
    • R(B);P_PINQ(b)
    • Threat
      • QAB1(C)
    • Vars
      • Q(b);N_SPINQ(b),OGATE,XR(B)::QAR1(C)
      • R(a);XR(E)::S(F),XR(a)
      • R(c);OGATE,XP(D)::QAB(C),XR(c)
      • S(f);N_GUARD,XB(G)::S(A)
      • Q(b);OGATE::QAR1(C)
      • B(d);N_GUARD::QAB(C),XB(d)
      • P(h);N_GUARD::QAR1(C)
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).