MESON Chess Problem Database

Problem Display
PID: 229093 (3br3/BKP1R3/4Nq2/1p3P1R/4kp2/2p5/Q5P1/2N1r3 w - - 0 1)

Levman, Semyon Semyonovich

HM., Arbeiter Schachzeitung, 1926

3br3/BKP1R3/4Nq2/1p3P1R/4kp2/2p5/Q5P1/2N1r3

#2

10 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sc5#
    • 1...Qxf5
      • 2.Sg5#
    • 1...Qxe6
      • 2.Qxe6#
  • Tries
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qd4#
      • 1...Qd4
        • 2.Sc5#
        • 2.Qxd4#
      • 1...bxc4!
    • 1.Qe2+?
      • 1...Kd5
        • 2.Rd7#
      • 1...Rxe2!
  • Keys
    • 1.Kc6!
      • threat
        • 2.Qd5#
      • 1...Qxe6+
        • 2.Qxe6#
      • 1...Ke5
        • 2.Qd5#
      • 1...Qxf5
        • 2.Sg5#
      • 1...Qd4
        • 2.Sc5#
      • 1...Qe5
        • 2.Qc2#
      • 1...Rd1
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(f);SBLOCK::R(J)+S(F),DCHECK
    • Q(f);SBLOCK,XP(D)::R(J)+S(F),DCHECK
    • Q(f);OGATE,P_SPINQ(f),XS(F)::QAR2(B),XQ(f)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(B)
      • Refutation
        • P(e);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::R(J)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • K(H);P_SPINS(F),S_FLIGHT
    • Threat
      • QAB1(B)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XS(F)::QAR2(B),XQ(f)
      • K(c);P-FLIGHT::QAR1(B)
      • Q(f);N_PINS(F),SBLOCK,XP(D)::R(J)+S(F),DCHECK
      • Q(f);N_PINS(F),SBLOCK::R(J)+S(F),DCHECK
      • Q(f);N_PINS(F),SBLOCK::QAB(B)
      • R(a);N_GUARD::QAR2(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).