MESON Chess Problem Database

Problem Display
PID: 231163 (8/7Q/8/3N2p1/2KPN1r1/4pkB1/R6b/7b w - - 0 1)

Aspengren, Frithiof

Schackvarlden, 1927

8/7Q/8/3N2p1/2KPN1r1/4pkB1/R6b/7b

#2

7 + 6

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg3
      • 2.Qf5#
    • 1...Bg1
      • 2.Qxh1#
    • 1...Bxg3
      • 2.Qxh1#
  • Tries
    • 1.Sxg5+?
      • 1...Kxg3
        • 2.Qxh2#
        • 2.Qh3#
      • 1...Rxg5!
    • 1.Qf7+?
      • 1...Kxe4
        • 2.Sc3#
      • 1...Rf4!
  • Keys
    • 1.Qh3!
      • 1...Kxe4
        • 2.Qxg4#
      • 1...Rxg3
        • 2.Sxg5#
        • 2.Qf5#
      • 1...Rxe4
        • 2.Bxh2#
      • 1...Bxg3
        • 2.Qxh1#
      • 1...Rf4
        • 2.Sxg5#
      • 1...Rh4
        • 2.Sxg5#
      • 1...Bg2
        • 2.Qxg2#
      • 1...Bg1
        • 2.Qxh1#
      • 1...e2
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • R(e);N_GUARD,XB(B)::QAR2(G)
    • B(b);OGATE::QAB(G),XB(a)
    • B(b);OGATE,XB(B)::QAB(G),XB(a)
  • Tries
    • Try
      • S(E);CHECK,P_SPINP(D),XP(f)
      • Refutation
        • R(e);N_PINP(D),XS(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);S_FLIGHT,XS(E)::S(F)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • Q(G);
    • Vars
      • K(d);S_FLIGHT,XS(E)::QAR2(G),XR(e)
      • R(e);N_GUARD,P_PINP(D),SBLOCK,XS(E)::QAR(G)+B(B),XB(b)
      • B(b);OGATE,P_SPINB(b),XB(B)::QAB(G),XB(a)
      • R(e);N_GUARD::S(E),XP(f)
      • B(a);N_GUARD::QAB1(G),XB(a)
      • B(b);OGATE::QAB(G),XB(a)
      • P(c);N_GUARD,SBLOCK::S(E)
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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).