MESON Chess Problem Database

Problem Display
PID: 176513 (4Q3/p3b3/4K3/3RpP2/6R1/4kp2/5p2/2n2B2 w - - 0 1)

Chernyavsky, Mykola Vasilovich

Schach-Echo, 1978

4Q3/p3b3/4K3/3RpP2/6R1/4kp2/5p2/2n2B2

#2

6 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Rd3#
    • 1...Sb3
      • 2.Rd3#
    • 1...Sd3
      • 2.Rxd3#
  • Tries
    • 1.Rdd4?
      • threat
        • 2.Rge4#
      • 1...Sd3
        • 2.Rxd3#
      • 1...e4
        • 2.Rgxe4#
      • 1...exd4!
    • 1.Qa4?
      • threat
        • 2.Re4#
        • 2.Qe4#
      • 1...Sd3
        • 2.Rxd3#
      • 1...e4
        • 2.Rxe4#
        • 2.Qd4#
        • 2.Qxe4#
      • 1...Bb4!
    • 1.Qxe7?
      • threat
        • 2.Qc5#
        • 2.Qg5#
        • 2.Qxa7#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sb3
        • 2.Rd3#
        • 2.Qg5#
      • 1...a5
        • 2.Qc5#
        • 2.Qg5#
        • 2.Qa7#
      • 1...a6
        • 2.Qc5#
        • 2.Qg5#
        • 2.Qa7#
      • 1...Se2!
    • 1.Qb8?
      • threat
        • 2.Qxe5#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Bf6
        • 2.Qxa7#
      • 1...e4
        • 2.Qf4#
      • 1...Bd6!
    • 1.Qh8?
      • threat
        • 2.Qxe5#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Bd6
        • 2.Qh6#
      • 1...e4
        • 2.Qd4#
      • 1...Bf6!
  • Keys
    • 1.Kxe5!
      • threat
        • 2.Re4#
      • 1...Bd6+
        • 2.Kxd6#
      • 1...Bf6+
        • 2.Kxf6#
      • 1...Sd3+
        • 2.Rxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::R1(C)
    • S(a);N_GUARD::R1(C),XS(a)
  • Tries
    • Try
      • R(C);
      • Threat
        • R1(B)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
        • P(e);::R1(B),XP(e)
      • Refutation
        • P(e);XR(C)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
      • Refutation
        • B(g);
    • Try
      • Q(F);XB(g)
      • Threat
        • DUALS(3)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XP(e)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
        • B(g);N_GUARD::QAB(F),XP(f)
        • P(e);OGATE::QAB1(F)
      • Refutation
        • B(g);
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XP(e)
      • Vars
        • S(a);N_GUARD::R1(C),XS(a)
        • B(g);N_GUARD::QAB(F)
        • P(e);OGATE::QAB1(F)
      • Refutation
        • B(g);
  • Actual
    • K(E);P-FLIGHT,XP(e)
    • Threat
      • R1(B)
    • Vars
      • B(g);CHECK::QAR(F)+K(E),XB(g)
      • S(a);CHECK,N_GUARD::R1(C),XS(a)
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).