MESON Chess Problem Database

Problem Display
PID: 173745 (3nB3/4Np1Q/4kB1P/8/1p2Np1p/1P2np1P/5Pp1/6K1 w - - 0 1)

Boros, Sandor

HM., Neue Leipziger Zeitung, 1926

3nB3/4Np1Q/4kB1P/8/1p2Np1p/1P2np1P/5Pp1/6K1

#2

10 + 9

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qf5#
    • 1...Sf1
      • 2.Qf5#
    • 1...Sc2
      • 2.Qf5#
    • 1...Sc4
      • 2.Qf5#
    • 1...Sg4
      • 2.Qf5#
    • 1...Sd5
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sc6
      • 2.Qxf7#
    • 1...Sb7
      • 2.Qxf7#
  • Tries
    • 1.Qg6?
      • 1...Sd1
        • 2.Qf5#
        • 2.Qg4#
      • 1...Sf1
        • 2.Qf5#
        • 2.Qg4#
      • 1...Sc2
        • 2.Qf5#
        • 2.Qg4#
      • 1...Sc4
        • 2.Qf5#
        • 2.Qg4#
      • 1...Sg4
        • 2.Qf5#
        • 2.Qxg4#
      • 1...Sd5
        • 2.Qf5#
        • 2.Qg4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Sb7
        • 2.Qxf7#
      • 1...fxg6!
    • 1.Qg8?
      • 1...Sd1
        • 2.Qg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sc2
        • 2.Qg4#
      • 1...Sc4
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sd5
        • 2.Qg4#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Sb7
        • 2.Qxf7#
      • 1...Sf5!
    • 1.Qg7?
      • 1...Sd1
        • 2.Qg4#
      • 1...Sf1
        • 2.Qg4#
      • 1...Sc2
        • 2.Qg4#
      • 1...Sc4
        • 2.Qg4#
      • 1...Sg4
        • 2.Qxg4#
      • 1...Sd5
        • 2.Qg4#
      • 1...Sc6
        • 2.Qxf7#
      • 1...Sb7
        • 2.Qxf7#
      • 1...Sf5!
  • Keys
    • 1.Sg6!
      • threat
        • 2.Sxf4#
      • 1...Kd5
        • 2.Sxf4#
      • 1...Kf5
        • 2.Sf8#
      • 1...fxg6
        • 2.Qd7#
      • 1...Sd5
        • 2.Sf8#

Anticipated by 193843(1916)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • S(b);N_GUARD::QAB1(I)
    • S(b);N_GUARD::QAB1(I),XS(b)
    • S(i);N_GUARD::QAB1(I),XP(h)
  • Tries
    • Try
      • Q(I);
      • Vars
        • S(b);N_GUARD::QAB1(I),XS(b)
        • S(i);N_GUARD::QAB1(I),XP(h)
      • Refutation
        • P(h);XQ(I)
    • Try
      • Q(I);P_PINP(h)
      • Vars
        • S(b);N_GUARD::QAB(I)
        • S(b);N_GUARD::QAB(I),XS(b)
        • S(i);N_GUARD::QAB1(I),XP(h)
      • Refutation
        • S(b);
    • Try
      • Q(I);
      • Vars
        • S(b);N_GUARD::QAB(I)
        • S(b);N_GUARD::QAB(I),XS(b)
        • S(i);N_GUARD::QAB1(I),XP(h)
      • Refutation
        • S(b);
  • Actual
    • S(H);
    • Threat
      • S(H),XP(e)
    • Vars
      • K(g);S_FLIGHT::S(H),XP(e)
      • K(g);S_FLIGHT::QAB(I)+S(H)
      • P(h);OGATE,XS(H)::QAB1(I)
      • S(b);SBLOCK::S(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).