MESON Chess Problem Database

Problem Display
PID: 255366 (8/1b2r3/4N1Np/K3PB1k/4p1pp/1p4Br/3pn1Q1/2b4R w - - 0 1)

Derevchuk, Oleksandr Andrinovich

Novitski, Petr Adrinovich

Problemist Ukraini, 2021

8/1b2r3/4N1Np/K3PB1k/4p1pp/1p4Br/3pn1Q1/2b4R

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rxg3
      • 2.Rxh4#
    • 1...Sg1
      • 2.Sgf4#
    • 1...Sc3
      • 2.Sgf4#
    • 1...Sxg3
      • 2.Sgf4#
    • 1...Sd4
      • 2.Sgf4#
    • 1...Sf4
      • 2.Sgxf4#
  • Tries
    • 1.Bf2?
      • threat
        • 2.Qxg4#
      • 1...Rg3
        • 2.Rxh4#
      • 1...Sg3
        • 2.Sgf4#
      • 1...g3!
    • 1.Bh2?
      • threat
        • 2.Qxg4#
      • 1...Sg3
        • 2.Sgf4#
      • 1...g3
        • 2.Qxe2#
      • 1...Rg3!
    • 1.Bf4?
      • threat
        • 2.Qxg4#
      • 1...Rg3
        • 2.Rxh4#
      • 1...g3
        • 2.Qxe2#
      • 1...Sg3!
    • 1.Rxh3?
      • threat
        • 2.Rxh4#
      • 1...gxh3
        • 2.Qxe2#
      • 1...Rxe6!
    • 1.Qxe4?
      • threat
        • 2.Bxg4#
        • 2.Qxg4#
      • 1...Rxg3
        • 2.Rxh4#
      • 1...Rxe6
        • 2.Qxg4#
      • 1...Sf4
        • 2.Sgxf4#
      • 1...Bxe4!
  • Keys
    • 1.Bxh4!
      • threat
        • 2.Qxg4#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Sg3
        • 2.Sef4#
      • 1...g3
        • 2.Qxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(e);OGATE,P_SPINP(h),XB(C)::R1(A),XP(h)
    • S(c);N_GUARD::S(H)
    • S(c);N_GUARD,XB(C)::S(H)
    • S(c);N_GUARD::S(H),XS(c)
  • Tries
    • Try
      • B(C);
      • Threat
        • QAB1(B),XP(g)
      • Vars
        • R(e);OGATE,P_SPINP(h)::R1(A),XP(h)
        • S(c);N_GUARD::S(H)
      • Refutation
        • P(g);
    • Try
      • B(C);
      • Threat
        • QAB1(B),XP(g)
      • Vars
        • S(c);N_GUARD::S(H)
        • P(g);OGATEB::QAB(B),XS(c)
      • Refutation
        • R(e);
    • Try
      • B(C);
      • Threat
        • QAB1(B),XP(g)
      • Vars
        • R(e);OGATE,P_SPINP(h)::R1(A),XP(h)
        • P(g);OGATEB::QAB(B),XS(c)
      • Refutation
        • S(c);
    • Try
      • R(A);P_PINP(h),XR(e)
      • Threat
        • R1(A),XP(h)
      • Vars
        • P(g);N_SPINP(h),OGATEB,XR(A)::QAB(B),XS(c)
      • Refutation
        • R(l);XS(G)
    • Try
      • Q(B);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);OGATE,P_SPINP(h),XB(C)::R1(A),XP(h)
        • R(l);XS(G)::QAB1(B),XP(g)
        • S(c);N_GUARD::S(H),XS(c)
      • Refutation
        • B(k);XQ(B)
  • Actual
    • B(C);XP(h)
    • Threat
      • QAB1(B),XP(g)
    • Vars
      • R(e);OGATEB::R(A)+B(C),XR(e)
      • S(c);N_GUARD::S(G)
      • P(g);OGATEB::QAB(B),XS(c)
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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).