MESON Chess Problem Database

Problem Display
PID: 269161 (3R2bb/5p2/1r2k3/1pR4B/qp1PP1nB/p4N2/2N5/KQ6 w - - 0 1)

Efrosinin, Oleg

64 Shakhmatnoe obozrenie, 2023

3R2bb/5p2/1r2k3/1pR4B/qp1PP1nB/p4N2/2N5/KQ6

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Qxb3#
    • 1...Qa5
      • 2.Qb3#
    • 1...Qa6
      • 2.Qb3#
    • 1...Qa7
      • 2.Qb3#
    • 1...Rc6
      • 2.Rxc6#
    • 1...Rb7
      • 2.Rc6#
    • 1...Rb8
      • 2.Rc6#
    • 1...Bxd4+
      • 2.Scxd4#
      • 2.Sfxd4#
    • 1...Se5
      • 2.d5#
    • 1...Sf6
      • 2.Re5#
    • 1...f5
      • 2.exf5#
  • Tries
    • 1.Re5+?
      • 1...Sxe5
        • 2.d5#
      • 1...Bxe5!
    • 1.Qa2+?
      • 1...Qb3
        • 2.Qxb3#
      • 1...b3!
  • Keys
    • 1.Rc7!
      • threat
        • 2.Re7#
      • 1...Bxd4+
        • 2.Scxd4#
      • 1...Qa7
        • 2.Qb3#
      • 1...Rb7
        • 2.Rc6#
      • 1...Bf6
        • 2.Bxg4#
      • 1...Sf6
        • 2.Sg5#
      • 1...f6
        • 2.d5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(b);N_GUARD::QAB(B),XQ(b)
    • Q(b);N_GUARD::QAB(B)
    • R(f);N_GUARD::R(H),XR(f)
    • R(f);N_GUARD::R(H)
    • S(d);N_PINP(E)::P(E)
    • S(d);N_GUARD,N_PINP(E),S_CUTB(j)::R1(H)
    • P(h);OGATE::P(F),XP(h)
  • Tries
    • Try
      • R(H);CHECK,N_SPINP(E)
      • Vars
        • S(d);XR(H)::P(E)
      • Refutation
        • B(j);P_PINP(E),XR(H)
    • Try
      • Q(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAB(B),XQ(b)
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • R(H);
    • Threat
      • R1(H)
    • Vars
      • B(j);CHECK,XP(E)::S(C),XB(j)
      • Q(b);N_GUARD::QAB(B)
      • R(f);N_GUARD::R(H)
      • B(j);S_CUTP(h)::B(I),XS(d)
      • S(d);N_PINP(E),SBLOCK::S(D)
      • P(h);N_PINP(E)::P(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).