MESON Chess Problem Database

Problem Display
PID: 165030 (1r2R1B1/8/Q2P3P/r3PN2/1p2k2K/1N1np3/4b1PB/q2R4 w - - 0 1)

Shanshin, Valery Yurevich

Best Problems, 2017

1r2R1B1/8/Q2P3P/r3PN2/1p2k2K/1N1np3/4b1PB/q2R4

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf5
      • 2.Bh7#
    • 1...Bf3
      • 2.Qxd3#
    • 1...Bg4
      • 2.Qxd3#
    • 1...Bh5
      • 2.Qxd3#
    • 1...Sf4
      • 2.Sg3#
  • Tries
    • 1.Kg5?
      • threat
        • 2.Sg3#
      • 1...Qxe5
        • 2.Qc4#
      • 1...Rxe5
        • 2.Qc6#
      • 1...Rxe8!
    • 1.Sd2+?
      • 1...Kxf5
        • 2.Bh7#
      • 1...exd2!
    • 1.Qc4+?
      • 1...Kxf5
        • 2.Bh7#
      • 1...Qd4!
    • 1.Qc6+?
      • 1...Kxf5
        • 2.Bh7#
      • 1...Rd5!
  • Keys
    • 1.Bh7!
      • threat
        • 2.Se7#
      • 1...Kd5
        • 2.Sxe3#
      • 1...Qxe5
        • 2.Qc4#
      • 1...Rxe5
        • 2.Qc6#
      • 1...Sxe5
        • 2.Sg7#
      • 1...Bg4
        • 2.Qxd3#
      • 1...Bh5
        • 2.Qxd3#
      • 1...Sf4
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • K(f);OGATEB,S_FLIGHT,XS(G)::B(L)
    • B(b);N_GUARD::QAB1(H),XS(c)
    • S(c);SBLOCK::S(G)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(a);N_GUARD,P_PINS(G),P_SPINQ(a),XP(F)::QAR2(H)
        • R(g);N_GUARD,P_PINS(G),P_SPINR(g),XP(F)::QAB(H)
      • Refutation
        • R(h);XR(K)
    • Try
      • S(D);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(G)::B(L)
      • Refutation
        • P(d);XS(D)
    • Try
      • Q(H);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(G)::B(L)
      • Refutation
        • Q(a);P_SPINQ(a)
    • Try
      • Q(H);CHECK
      • Vars
        • K(f);S_FLIGHT,XS(G)::B(L)
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • B(L);
    • Threat
      • B(L)+S(G)
    • Vars
      • K(f);P_SPINS(c),S_FLIGHT::S(G),XP(d)
      • Q(a);N_GUARD,P_SPINQ(a),XP(F)::QAR2(H)
      • R(g);N_GUARD,P_SPINR(g),XP(F)::QAB(H)
      • S(c);P_SPINS(c),XP(F)::B(L)+S(G)
      • B(b);N_GUARD::QAB1(H),XS(c)
      • S(c);SBLOCK::B(L)+S(G),DCHECK
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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).