MESON Chess Problem Database

Problem Display
PID: 102854 (3R3n/6P1/Kp4q1/1N1N4/2BBkPP1/p1p2p2/2r1n3/7Q w - - 0 1)

Hermanson, Halvar

Northwest Chess, 1975

3R3n/6P1/Kp4q1/1N1N4/2BBkPP1/p1p2p2/2r1n3/7Q

#2

10 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qh7
      • 2.Re8#
    • 1...Qe8
      • 2.Rxe8#
  • Tries
    • 1.Re8+?
      • 1...Qe6
        • 2.Rxe6#
      • 1...Qxe8!
    • 1.Qb1?
      • threat
        • 2.Qxc2#
      • 1...Sxd4
        • 2.Sbxc3#
      • 1...Sxf4
        • 2.Sdxc3#
      • 1...f2
        • 2.Qh1#
      • 1...Sc1!
    • 1.Qg1?
      • threat
        • 2.Qe3#
      • 1...Qxg4
        • 2.Sd6#
      • 1...f2
        • 2.Qh1#
        • 2.Qg2#
      • 1...Sxg1!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Re8#
      • 1...Sxd4
        • 2.Sd6#
      • 1...Sxf4
        • 2.Sf6#
      • 1...f2
        • 2.Qh1#
      • 1...Sf7
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(h);N_GUARD::R(J)
    • Q(h);N_GUARD::R(J),XQ(h)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • Q(h);N_GUARD,P_SPINQ(h)::R(J),XQ(h)
      • Refutation
        • Q(h);XR(J)
    • Try
      • Q(A);N_PINP(e),P_PINR(a)
      • Threat
        • QAB(A),XR(a)
      • Vars
        • S(b);N_GUARD,SBLOCK,XB(C)::S(F),XP(d)
        • S(b);N_GUARD,SBLOCK,XP(D)::S(G),XP(d)
        • P(e);OGATEB::QAB(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);N_PINP(e)
      • Threat
        • QAR1(A)
      • Vars
        • Q(h);N_GUARD,XP(E)::S(F)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • Q(A);N_PINP(e),P_PINQ(h)
    • Threat
      • R(J)
    • Vars
      • S(b);SBLOCK,XB(C)::S(F)
      • S(b);SBLOCK,XP(D)::S(G)
      • P(e);OGATEB::QAB(A)
      • S(i);N_GUARD::QAB(A),XQ(h)
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).