MESON Chess Problem Database

Problem Display
PID: 177972 (1N2bK1b/2B1p1n1/R1p1k3/4p1Pp/4B1p1/p2pQ2N/qp6/2n5 w - - 0 1)

Bogdanov, Evgeny Mikhailovich

Leun, Evgeny

4th HM., Sahs (Latvia), 1987

1N2bK1b/2B1p1n1/R1p1k3/4p1Pp/4B1p1/p2pQ2N/qp6/2n5

#2

8 + 14

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bg6
      • 2.Rxc6#
    • 1...Bf7
      • 2.Rxc6#
  • Tries
    • 1.Bxd3?
      • threat
        • 2.Sf4#
        • 2.Qxe5#
      • 1...Kd5
        • 2.Qxe5#
      • 1...gxh3
        • 2.Qxe5#
      • 1...e4
        • 2.Qxe4#
      • 1...Qc4
        • 2.Qxe5#
      • 1...Qd5
        • 2.Sf4#
      • 1...Se2
        • 2.Qxe5#
      • 1...Sf5
        • 2.Sf4#
      • 1...Sxd3!
    • 1.Bg6?
      • threat
        • 2.Sf4#
        • 2.Qxe5#
      • 1...Bxg6
        • 2.Qxe5#
      • 1...gxh3
        • 2.Qxe5#
      • 1...Qd5
        • 2.Sf4#
      • 1...Qc4
        • 2.Qxe5#
      • 1...Se2
        • 2.Qxe5#
      • 1...Sf5
        • 2.Sf4#
      • 1...e4
        • 2.Sf4#
        • 2.Qxe4#
      • 1...Kd5!
    • 1.Bh7?
      • threat
        • 2.Sf4#
        • 2.Qxe5#
      • 1...gxh3
        • 2.Qxe5#
      • 1...Bg6
        • 2.Qxe5#
      • 1...Qd5
        • 2.Sf4#
      • 1...Qc4
        • 2.Qxe5#
      • 1...Se2
        • 2.Qxe5#
      • 1...Sf5
        • 2.Sf4#
      • 1...e4
        • 2.Sf4#
        • 2.Qxe4#
      • 1...Kd5!
    • 1.Qd4?
      • threat
        • 2.Qxe5#
      • 1...exd4
        • 2.Sf4#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Sf5!
    • 1.Qf4?
      • threat
        • 2.Qxe5#
      • 1...exf4
        • 2.Sxf4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Qd5!
    • 1.Qc5?
      • threat
        • 2.Qxe7#
        • 2.Qxe5#
      • 1...Qd5
        • 2.Qxe7#
        • 2.Qxd5#
      • 1...Sf5!
  • Keys
    • 1.Bxc6!
      • threat
        • 2.Qxe5#
      • 1...Kf5
        • 2.Be4#
      • 1...Qd5
        • 2.Bd7#
      • 1...Sf5
        • 2.Sf4#
      • 1...e4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(m);N_GUARD::R(E),XP(i)
  • Tries
    • Try
      • B(C);N_PINP(i),P_PINP(g),XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • K(j);N_SPINP(g),S_FLIGHT::QAR1(A),XP(g)
        • P(f);XS(B)::QAR1(A),XP(g)
        • P(g);OGATEB::QAR2(A),XP(g)
        • Q(b);::QAR1(A),XP(g)
        • Q(b);::S(B)
        • S(a);::QAR1(A),XP(g)
        • S(l);::S(B)
      • Refutation
        • S(a);XB(C)
    • Try
      • B(C);N_PINP(i),P_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • B(m);XB(C)::QAR1(A),XP(g)
        • P(f);XS(B)::QAR1(A),XP(g)
        • Q(b);::S(B)
        • Q(b);::QAR1(A),XP(g)
        • S(a);::QAR1(A),XP(g)
        • S(l);::S(B)
      • Refutation
        • K(j);N_SPINP(g),S_FLIGHT
    • Try
      • B(C);N_PINP(i),P_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);XS(B)::QAR1(A),XP(g)
        • B(m);::QAR1(A),XP(g)
        • Q(b);::S(B)
        • Q(b);::QAR1(A),XP(g)
        • S(a);::QAR1(A),XP(g)
        • S(l);::S(B)
      • Refutation
        • K(j);N_SPINP(g),S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(g)
      • Vars
        • P(g);N_GUARD,XQ(A)::S(B)
        • Q(b);N_GUARD::QAB1(A),XQ(b)
      • Refutation
        • S(l);
    • Try
      • Q(A);
      • Threat
        • QAR1(A),XP(g)
      • Vars
        • P(g);XQ(A)::S(B),XP(g)
        • S(l);N_GUARD::QAB1(A),XS(l)
      • Refutation
        • Q(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Refutation
        • S(l);
  • Actual
    • B(C);P_PINP(g),XP(i)
    • Threat
      • QAR1(A),XP(g)
    • Vars
      • K(j);N_SPINP(g),S_FLIGHT::B(C)
      • Q(b);SBLOCK::R(E)+B(C),DCHECK
      • S(l);SBLOCK::S(B)
      • P(g);OGATEB::QAR2(A),XP(g)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).