MESON Chess Problem Database

Problem Display
PID: 202448 (K2N4/6p1/6p1/2p1k1P1/2PR2Pp/2Q5/2nN4/6n1 w - - 0 1)

Neunivako, Pavel Efimovich

Shakhmaty, 1923

K2N4/6p1/6p1/2p1k1P1/2PR2Pp/2Q5/2nN4/6n1

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Sf3#
    • 1...Sf3
      • 2.Sxf3#
    • 1...Sh3
      • 2.Sf3#
    • 1...Sa1
      • 2.Qe3#
    • 1...Se1
      • 2.Qe3#
    • 1...Sa3
      • 2.Qe3#
    • 1...Se3
      • 2.Qxe3#
    • 1...Sb4
      • 2.Qe3#
  • Tries
    • 1.Rd7+?
      • 1...Sd4
        • 2.Qe3#
      • 1...Kf4!
    • 1.Qb3?
      • 1...Kxd4
        • 2.Sc6#
      • 1...Sxd4
        • 2.Qb8#
      • 1...cxd4
        • 2.Qb8#
      • 1...Se2
        • 2.Sf3#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sh3
        • 2.Sf3#
      • 1...Sa1
        • 2.Qe3#
      • 1...Se1
        • 2.Qe3#
      • 1...Sa3
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sb4
        • 2.Qe3#
      • 1...h3!
    • 1.Qg3+?
      • 1...Kxd4
        • 2.Sc6#
        • 2.Se6#
      • 1...hxg3!
  • Keys
    • 1.Qh3!
      • 1...Kxd4
        • 2.Sc6#
      • 1...Sxh3
        • 2.Sf3#
      • 1...Sxd4
        • 2.Qh2#
      • 1...cxd4
        • 2.Qh2#
      • 1...Se2
        • 2.Sf3#
      • 1...Sf3
        • 2.Sxf3#
      • 1...Sa1
        • 2.Qe3#
      • 1...Se1
        • 2.Qe3#
      • 1...Sa3
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sb4
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(b);N_GUARD::QAR2(B)
    • S(b);N_GUARD::QAR2(B),XS(b)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAR2(B)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(e);S_FLIGHT,XR(D)::S(H)
        • S(b);SBLOCK,XR(D)::QAB(B)
        • P(d);SBLOCK,XR(D)::QAB(B)
        • S(a);N_GUARD::S(A)
        • S(a);N_GUARD::S(A),XS(a)
        • S(b);N_GUARD::QAR2(B)
        • S(b);N_GUARD::QAR2(B),XS(b)
      • Refutation
        • P(c);
    • Try
      • Q(B);CHECK
      • Refutation
        • P(c);XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(e);S_FLIGHT,XR(D)::S(H)
      • S(a);N_GUARD,XQ(B)::S(A)
      • S(b);SBLOCK,XR(D)::QAB(B)
      • P(d);SBLOCK,XR(D)::QAB(B)
      • S(a);N_GUARD::S(A)
      • S(a);N_GUARD::S(A),XS(a)
      • S(b);N_GUARD::QAR2(B)
      • S(b);N_GUARD::QAR2(B),XS(b)
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).