MESON Chess Problem Database

Problem Display
PID: 261304 (1b3B2/8/pRQ1N1n1/4k3/6r1/1pP1prpb/1K1Nn1q1/1B6 w - - 0 1)

Uberwasser, Adrian

Neue Zurcher Zeitung, 1985

1b3B2/8/pRQ1N1n1/4k3/6r1/1pP1prpb/1K1Nn1q1/1B6

#2

8 + 12

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sef4
      • 2.Bg7#
  • Tries
    • 1.Qd5+?
      • 1...Kf6
        • 2.Sc7#
      • 1...Kxd5!
    • 1.Qc7+?
      • 1...Kd5
        • 2.Qc5#
      • 1...Kf6
        • 2.Bg7#
        • 2.Qg7#
      • 1...Bxc7!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qe4#
        • 2.Qf6#
      • 1...Kxf4
        • 2.Qf6#
      • 1...Rfxf4
        • 2.Qe6#
      • 1...Rgxf4
        • 2.Qc5#
      • 1...Sxc3
        • 2.Qf6#
      • 1...Sexf4
        • 2.Bg7#
        • 2.Qe4#
      • 1...Sgxf4
        • 2.Sc4#
        • 2.Qe4#
      • 1...Bd6
        • 2.Qxd6#
      • 1...Rf1
        • 2.Qf6#
      • 1...Rf2
        • 2.Qf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • S(a);P_PINS(C),S_CUTR(e)::B(H)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(i);N_GUARD,S_FLIGHT::R(E)+S(G)
      • Refutation
        • K(i);P-FLIGHT,XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(i);N_GUARD,P-FLIGHT::QAR1(F)
      • Refutation
        • B(l);XQ(F)
  • Actual
    • S(G);
    • Threat
      • DUALS(2)
    • Vars
      • K(i);S_FLIGHT,XS(G)::QAR2(F)
      • R(e);SBLOCK,XS(G)::QAR1(F)
      • R(h);SBLOCK,XS(G)::QAR2(F)
      • S(a);P_PINS(C),XP(D)::QAB1(F)
      • B(l);N_GUARD::QAB1(F),XB(l)
      • R(e);::QAB1(F)
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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).