MESON Chess Problem Database

Problem Display
PID: 250063 (4r3/4R1p1/pQ6/3p4/4q2N/p2p3K/4kp2/R4N2 w - - 0 1)

Ovchinnikov, Valentin N

2nd HM., 64 Shakhmatnoe obozrenie, 1927

4r3/4R1p1/pQ6/3p4/4q2N/p2p3K/4kp2/R4N2

#2

6 + 9

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3+
      • 2.Qxe3#
    • 1...Qe6+
      • 2.Qxe6#
    • 1...d2
      • 2.Qxa6#
  • Tries
    • 1.Ra2+?
      • 1...Kd1
        • 2.Qb1#
      • 1...Ke1
        • 2.Qb1#
      • 1...Kxf1
        • 2.Qxf2#
      • 1...d2!
    • 1.Rxe4+?
      • 1...dxe4
        • 2.Qe3#
      • 1...Rxe4!
    • 1.Qa5?
      • threat
        • 2.Qd2#
      • 1...Qe3+
        • 2.Sg3#
      • 1...d2
        • 2.Qxd2#
        • 2.Qxa6#
      • 1...Qe6+!
    • 1.Qb2+?
      • 1...d2
        • 2.Qxd2#
      • 1...axb2!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qd2#
      • 1...Qe3+
        • 2.Sg3#
      • 1...Qe6+
        • 2.Qg4#
      • 1...d2
        • 2.Qxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(e);CHECK,N_GUARD::QAR1(E),XQ(e)
    • Q(e);CHECK,OGATEB::QAR(E),XQ(e)
    • P(d);OGATEB::QAB(E),XP(g)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(a);N_SPINQ(e),S_CUTP(d),S_FLIGHT::QAR2(E)
        • K(a);P-FLIGHT,S_CUTP(d)::QAR(E)
        • K(a);N_GUARD,N_SPINQ(e),S_FLIGHT,XS(B)::QAR1(E),XP(b)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • R(F);CHECK,XQ(e)
      • Vars
        • P(f);XR(F)::QAR1(E)
      • Refutation
        • R(i);XR(F)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • Q(e);CHECK::S(B)
      • Refutation
        • Q(e);CHECK
    • Try
      • Q(E);CHECK
      • Vars
        • P(d);P_SPINP(d)::QAR1(E),XP(d)
      • Refutation
        • P(c);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • Q(e);CHECK::S(B)
      • Q(e);CHECK,OGATE::QAB(E)
      • P(d);::QAR1(E),XP(d)
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).