MESON Chess Problem Database

Problem Display
PID: 201957 (B7/1q3R2/3B1N2/4p1KN/2pQ4/r4k2/b4ppp/1r4b1 w - - 0 1)

Shanshin, Valery Yurevich

Harmonie Aktiv, 2016

B7/1q3R2/3B1N2/4p1KN/2pQ4/r4k2/b4ppp/1r4b1

#2

7 + 11

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxe4#
    • 1...Re3
      • 2.Qg4#
    • 1...c3
      • 2.Qd3#
  • Tries
    • 1.Sd5+?
      • 1...Qxf7
        • 2.Qg4#
      • 1...Ke2!
    • 1.Bxb7+?
      • 1...Rxb7
        • 2.Qe4#
      • 1...e4
        • 2.Qxe4#
      • 1...Ke2!
    • 1.Qd1+?
      • 1...Ke3
        • 2.Bc5#
      • 1...Rxd1!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Sfh5#
      • 1...Kxg3
        • 2.Qg4#
      • 1...Rxa8
        • 2.Qc3#
      • 1...exd4
        • 2.Sg4#
      • 1...c3
        • 2.Qd3#
      • 1...e4
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(k);N_GUARD::QAB1(A),XQ(k)
    • R(g);SBLOCK::QAB1(A)
    • P(i);N_GUARD,S_CUTR(g)::QAR2(A)
  • Tries
    • Try
      • S(E);CHECK,N_PINQ(k)
      • Vars
        • Q(k);XR(F)::QAB1(A)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • B(G);CHECK,XQ(k)
      • Vars
        • R(a);XB(G)::QAB1(A)
        • P(j);P_SPINP(j)::QAB1(A),XP(j)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(h);N_SPINQ(k),P-FLIGHT::B(D)
      • Refutation
        • R(a);XQ(A)
  • Actual
    • S(C);
    • Threat
      • R(F)+S(E)
    • Vars
      • K(h);N_SPINQ(k),P-FLIGHT,P_SPINP(j),XS(C)::QAR1(A)
      • R(g);N_GUARD,N_SPINQ(k),XB(G)::QAR(A)
      • P(j);XQ(A)::R(F)+S(E)
      • P(i);N_GUARD,S_CUTR(g)::QAR2(A)
      • P(j);N_SPINQ(k)::R(F)+S(E)
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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).