MESON Chess Problem Database

Problem Display
PID: 147665 (3R4/K2N1pB1/nP3P1q/7p/3kN2R/4p3/Qp2p3/1B1rnr2 w - - 0 1)

Isaev, Leonid Antonovich

Bristol Times, 1929

3R4/K2N1pB1/nP3P1q/7p/3kN2R/4p3/Qp2p3/1B1rnr2

#2

10 + 11

35 L'Italia Scacchistica 1930

SOLUTION

  • SOUND
  • Tries
    • 1.Sd2+?
      • 1...Qf4
        • 2.Qc4#
      • 1...Rf4
        • 2.Qc4#
      • 1...Kc3!
    • 1.Sc3+?
      • 1...Qf4
        • 2.Sxe2#
        • 2.Sb5#
      • 1...Rf4
        • 2.Sxe2#
        • 2.Sb5#
      • 1...Kxc3!
    • 1.Sg3+?
      • 1...Qf4
        • 2.Sxe2#
      • 1...Rf4
        • 2.Sxe2#
      • 1...Kc3!
    • 1.Sd6+?
      • 1...Qf4
        • 2.Sb5#
        • 2.Qc4#
      • 1...Rf4
        • 2.Sb5#
        • 2.Qc4#
      • 1...Kc3!
    • 1.Qxb2+?
      • 1...Kc4
        • 2.Se5#
      • 1...Kd5!
    • 1.Qa4+?
      • 1...Kd5
        • 2.Ba2#
      • 1...Sb4!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Se5#
      • 1...Kc4
        • 2.Sd2#
      • 1...Qxf6
        • 2.Sf2#
      • 1...Rxf6
        • 2.Sg5#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Qh8
        • 2.Sf2#
      • 1...Sb4
        • 2.Qc5#
      • 1...Sc7
        • 2.Qc5#
      • 1...Sb8
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • Q(j);P_SPINQ(j)::QAR1(B)
        • R(c);P_SPINR(c)::QAR1(B)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(C);CHECK
      • Refutation
        • K(g);S_FLIGHT,XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • Q(j);P_SPINQ(j)::S(C),XP(e)
        • R(c);P_SPINR(c)::S(C),XP(e)
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • S(C);CHECK
      • Refutation
        • K(g);S_FLIGHT
    • Try
      • Q(B);CHECK,XP(d)
      • Vars
        • K(g);P-FLIGHT::S(H)
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(g);P-FLIGHT::B(A)
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(B);
    • Threat
      • R(J)+S(H)
    • Vars
      • K(g);P-FLIGHT::R(D)+S(C),DCHECK
      • Q(j);N_GUARD,P_SPINQ(j),XP(F)::R(D)+S(C)
      • R(c);N_GUARD,P_SPINR(c),XP(F)::R(D)+S(C)
      • S(i);N_GUARD::QAB1(B),XS(i)
      • Q(j);N_GUARD::R(D)+S(C)
      • S(i);N_GUARD::QAB1(B)
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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).