MESON Chess Problem Database

Problem Display
PID: 177830 (B3RQ2/8/p7/3rN2K/n2Nk3/2q2R2/1B5b/n7 w - - 0 1)

Kotlyar, Valery

Sahs (Latvia), 1983

B3RQ2/8/p7/3rN2K/n2Nk3/2q2R2/1B5b/n7

#2

8 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qb4#
    • 1...Qe1
      • 2.Qf5#
    • 1...Qd2
      • 2.Qf5#
    • 1...Qb4
      • 2.Qf5#
    • 1...Qxd4
      • 2.Qf5#
    • 1...Qa5
      • 2.Qf5#
    • 1...Qc1
      • 2.Qf5#
    • 1...Qc2
      • 2.Qf5#
    • 1...Qa3
      • 2.Qf5#
    • 1...Qb3
      • 2.Qf5#
    • 1...Qd3
      • 2.Qf5#
    • 1...Qe3
      • 2.Qf5#
    • 1...Qxf3+
      • 2.Qxf3#
    • 1...Qc4
      • 2.Qf5#
    • 1...Qc5
      • 2.Qf5#
    • 1...Qc6
      • 2.Qf5#
    • 1...Qc7
      • 2.Qf5#
    • 1...Bg1
      • 2.Qf4#
    • 1...Bf4
      • 2.Qxf4#
    • 1...Bxe5
      • 2.Qf4#
  • Tries
    • 1.Sc2?
      • threat
        • 2.Qf5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Qc8
        • 2.Re3#
      • 1...Bf4
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Sxc2!
    • 1.Se2?
      • threat
        • 2.Qf5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Qc8!
    • 1.Sb3?
      • threat
        • 2.Qf5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Qc8
        • 2.Sd2#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Sxb3!
    • 1.Sb5?
      • threat
        • 2.Qf5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Qc8
        • 2.Sd6#
      • 1...Bf4
        • 2.Qxf4#
      • 1...axb5!
    • 1.Bxd5+?
      • 1...Kxd4
        • 2.Rd3#
      • 1...Kxd5!
    • 1.Rd3?
      • threat
        • 2.Qf3#
        • 2.Qf5#
      • 1...Qxd4
        • 2.Qf3#
      • 1...Qc8
        • 2.Qf3#
      • 1...Bf4
        • 2.Qf5#
      • 1...Qxd3!
    • 1.Qf7?
      • threat
        • 2.Qxd5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Kxd4
        • 2.Qxd5#
      • 1...Qxd4
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Qa5
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Qb3
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Qc4
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Qc5
        • 2.Qg6#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Qc6
        • 2.Qf5#
      • 1...Sb6!
  • Keys
    • 1.Se6!
      • threat
        • 2.Qf5#
      • 1...Qxe5+
        • 2.Sg5#
      • 1...Qxf3+
        • 2.Qxf3#
      • 1...Kxe5
        • 2.Re3#
      • 1...Bf4
        • 2.Qxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 18
  • Sets
    • K(e);N_SPINR(f),OGATEB,P-FLIGHT,P_SPINQ(c),XS(C)::QAR2(H)
    • Q(c);::QAB1(H)
    • Q(c);XS(C)::QAB1(H)
    • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
    • Q(c);N_SPINR(f)::QAB1(H)
    • B(b);N_GUARD::QAR1(H)
    • B(b);N_GUARD::QAR1(H),XB(b)
    • B(b);N_GUARD,P_SPINB(b),XS(D)::QAR1(H)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
        • Q(c);N_GUARD::R1(B)
      • Refutation
        • S(a);XS(C)
    • Try
      • S(C);
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
        • B(b);N_GUARD::QAR1(H),XB(b)
      • Refutation
        • Q(c);
    • Try
      • S(C);
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
        • Q(c);N_GUARD::S(C)
        • B(b);N_GUARD::QAR1(H),XB(b)
      • Refutation
        • S(a);XS(C)
    • Try
      • S(C);
      • Threat
        • QAB1(H)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
        • Q(c);::S(C)
        • B(b);N_GUARD::QAR1(H),XB(b)
      • Refutation
        • P(g);XS(C)
    • Try
      • B(F);CHECK,N_SPINS(D),XR(f)
      • Vars
        • K(e);P-FLIGHT,P_SPINQ(c),XS(C)::R1(B)
      • Refutation
        • K(e);S_FLIGHT,XB(F)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XS(C)::QAB1(H)
        • Q(c);::QAB1(H)
        • B(b);::QAB1(H)
      • Refutation
        • Q(c);XR(B)
    • Try
      • Q(H);
      • Threat
        • QAB1(H),XR(f)
      • Vars
        • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
        • K(e);N_SPINR(f),P-FLIGHT,P_SPINQ(c),XS(C)::QAR1(H),XR(f)
        • Q(c);N_SPINR(f)::QAB1(H)
      • Refutation
        • S(d);
  • Actual
    • S(C);
    • Threat
      • QAB1(H)
    • Vars
      • Q(c);CHECK,XS(D)::S(C)
      • Q(c);CHECK,OGATE,XR(B)::QAB1(H),XQ(c)
      • K(e);N_SPINR(f),P-FLIGHT,P_SPINQ(c),XS(D)::R(B)
      • B(b);N_GUARD::QAR1(H),XB(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).