MESON Chess Problem Database

Problem Display
PID: 86513 (1b1R2q1/8/3n1NP1/3bR3/N1pkpK2/1P1B1p2/3p4/5Q2 w - - 0 1)

Erokhin, Vladimir Alekseevich

Melnichenko, Viktor Oleksandrovich

The Problemist, 1979

1b1R2q1/8/3n1NP1/3bR3/N1pkpK2/1P1B1p2/3p4/5Q2

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qh7
      • 2.Rxd5#
    • 1...Qxg6
      • 2.Rxd5#
    • 1...Qg7
      • 2.Rxd5#
    • 1...Qxd8
      • 2.Rxd5#
    • 1...Qe8
      • 2.Rxd5#
    • 1...Qf8
      • 2.Rxd5#
    • 1...Qh8
      • 2.Rxd5#
    • 1...Be6
      • 2.Rxe4#
    • 1...Bf7
      • 2.Rxe4#
    • 1...Sf7
      • 2.Rxd5#
    • 1...cxd3
      • 2.Qa1#
    • 1...exd3
      • 2.Qf2#
  • Tries
    • 1.Bxc4?
      • threat
        • 2.Qa1#
      • 1...Bxc4
        • 2.Rxe4#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1S
        • 2.Qxd1#
      • 1...d1B
        • 2.Qxd1#
      • 1...d1R
        • 2.Qxd1#
      • 1...Sb5!
    • 1.Qa1+?
      • 1...c3
        • 2.Qxc3#
      • 1...Kxd3!
    • 1.Qf2+?
      • 1...e3
        • 2.Qxe3#
      • 1...Kxd3!
  • Keys
    • 1.Bxe4!
      • threat
        • 2.Qf2#
      • 1...Bxe4
        • 2.Rxe4#
      • 1...Sxe4
        • 2.Qxc4#
      • 1...cxb3
        • 2.Qd3#
      • 1...d1S
        • 2.Qxd1#
      • 1...Sf5
        • 2.Qxc4#
      • 1...f2
        • 2.Qxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 12
  • Sets
    • Q(i);N_GUARD::R1(F),XB(f)
    • Q(i);N_GUARD,XP(H)::R1(F),XB(f)
    • Q(i);N_GUARD,XR(I)::R1(F),XB(f)
    • Q(i);N_GUARD,P_PINS(G)::R1(F),XB(f)
    • B(f);N_GUARD,P_SPINS(g)::R1(F),XP(e)
    • S(g);OGATE,P_PINR(F),P_SPINB(f)::R1(I),XB(f)
    • P(c);N_GUARD,SBLOCK,XB(C)::QAB(A)
    • P(e);N_GUARD,SBLOCK,XB(C)::QAB(A)
  • Tries
    • Try
      • B(C);XP(c)
      • Threat
        • QAB(A)
      • Vars
        • B(f);N_GUARD,P_SPINS(g),XB(C)::R1(F),XP(e)
        • S(g);OGATE,P_PINR(F),P_SPINB(f),XB(C)::QAR1(A),XS(g)
        • P(a);OGATEB::QAR(A),XQ(a)
        • P(a);OGATEB::QAR(A),XS(a)
        • P(a);OGATEB::QAR(A),XB(a)
        • P(a);OGATEB::QAR(A),XR(a)
      • Refutation
        • S(g);P_PINR(F),P_SPINB(f)
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAB1(A),XP(c)
      • Refutation
        • K(d);P-FLIGHT,XB(C)
    • Try
      • Q(A);CHECK
      • Vars
        • P(e);P_SPINP(e)::QAB1(A),XP(e)
      • Refutation
        • K(d);P-FLIGHT,XB(C)
  • Actual
    • B(C);XP(e)
    • Threat
      • QAB(A)
    • Vars
      • B(f);OGATE,P_SPINS(g),XB(C)::R1(F),XB(f)
      • S(g);N_GUARD,P_PINR(F),P_SPINB(f),XB(C)::QAR1(A),XP(c)
      • P(c);N_GUARD,XP(B)::QAR1(A)
      • P(a);OGATEB::QAR(A),XS(a)
      • S(g);N_GUARD,P_PINR(F),P_SPINB(f)::QAR1(A),XP(c)
      • P(b);::QAB(A),XP(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).