MESON Chess Problem Database

Problem Display
PID: 249945 (n2R2r1/K5b1/p1kNR3/r2N4/n1pp4/B4Q1b/8/8 w - - 0 1)

Ulehla, Johann Viktor

Deutsche Schachzeitung, 1938

n2R2r1/K5b1/p1kNR3/r2N4/n1pp4/B4Q1b/8/8

#2

7 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Sf5#
    • 1...Sc7
      • 2.Se7#
  • Tries
    • 1.Sb4+?
      • 1...Kc5
        • 2.Sa2#
        • 2.Sc2#
        • 2.Sd3#
        • 2.Sxa6#
        • 2.Sc6#
        • 2.Qd5#
        • 2.Qc6#
      • 1...Kc7!
    • 1.Sb6+?
      • 1...Kc7
        • 2.Rd7#
      • 1...Rd5!
    • 1.Sf6+?
      • 1...Kc7
        • 2.Rd7#
      • 1...Rd5!
    • 1.Sxc4+?
      • 1...Kb5
        • 2.Qb3#
      • 1...Bxe6!
    • 1.Rc8+?
      • 1...Kd7
        • 2.Re7#
        • 2.Qf7#
      • 1...Sc7
        • 2.Rxc7#
      • 1...Rxc8!
  • Keys
    • 1.Qf7!
      • threat
        • 2.Qb7#
      • 1...Kxd5
        • 2.Se8#
      • 1...Rb5
        • 2.Sf5#
      • 1...Sc5
        • 2.Sb4#
      • 1...Sc7
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(e);SBLOCK::R(E)+S(D)
    • S(i);SBLOCK::QAB(B)+S(C),DCHECK
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • S(C);CHECK
      • Vars
        • K(g);P-FLIGHT,S_CUTR(e)::R1(G)
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • S(C);CHECK
      • Vars
        • K(g);P-FLIGHT,S_CUTR(e)::R1(G)
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • S(D);CHECK,XP(c)
      • Vars
        • K(g);S_CUTB(a),S_FLIGHT::QAR2(B)
      • Refutation
        • B(a);XR(E)
    • Try
      • R(G);CHECK
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::R1(G),XS(i)
      • Refutation
        • R(j);XR(G)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(g);N_GUARD,S_CUTB(a),S_FLIGHT,XS(C)::R(G)+S(D)
      • R(e);SBLOCK::R(E)+S(D)
      • S(b);SBLOCK::S(C)
      • S(i);SBLOCK::S(C)
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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).