MESON Chess Problem Database

Problem Display
PID: 54326 (1BnbK3/1Np3pN/3r1P2/1RQPkP1R/1p2p3/6P1/3P1P2/5r1b w - - 0 1)

Melnichenko, Viktor Oleksandrovich

Rudenko, Valentin Fedorovich

The Problemist, 2004

1BnbK3/1Np3pN/3r1P2/1RQPkP1R/1p2p3/6P1/3P1P2/5r1b

#2

13 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qxd5#
    • 1...Ra6
      • 2.d6#
    • 1...Rb6
      • 2.d6#
    • 1...Rc6
      • 2.dxc6#
    • 1...Re6+
      • 2.dxe6#
    • 1...Rxf6
      • 2.d6#
    • 1...Rd7
      • 2.d6#
    • 1...b3
      • 2.Qc3#
    • 1...c6
      • 2.dxc6#
    • 1...g5
      • 2.fxg5 ep#
    • 1...g6
      • 2.fxg6#
  • Tries
    • 1.Rxb4?
      • threat
        • 2.Qd4#
      • 1...Re6+
        • 2.dxe6#
      • 1...g5
        • 2.fxg5 ep#
      • 1...Rxd5!
    • 1.Qxb4?
      • threat
        • 2.Qc3#
        • 2.Qb2#
      • 1...Re6+
        • 2.dxe6#
      • 1...c5
        • 2.dxc5 ep#
      • 1...g5
        • 2.fxg5 ep#
      • 1...Rb1
        • 2.Qc3#
      • 1...Rc6
        • 2.dxc6#
      • 1...e3
        • 2.Qf4#
      • 1...Rc1!
    • 1.f4+?
      • 1...exf4 ep
        • 2.Qe3#
      • 1...Rxf4!
  • Keys
    • 1.Qe3!
      • threat
        • 2.d4#
      • 1...Re6+
        • 2.dxe6#
      • 1...c5
        • 2.dxc5 ep#
      • 1...g5
        • 2.fxg5 ep#
      • 1...Rd1
        • 2.f4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • R(f);OGATE,P_SPINP(g),P_SPINR(f),XP(F)::QAR1(E),XR(f)
    • R(f);OGATE,P_SPINP(g)::QAR(E)+P(F)
    • R(f);OGATE,P_SPINP(g)::QAR(E)+P(F),XR(f)
    • R(f);CHECK,OGATE,P_SPINP(g)::QAR(E)+P(F),XR(f)
    • R(f);OGATE,P_SPINP(g),XP(I)::QAR(E)+P(F)
    • P(c);N_GUARD::QAB(E)
    • P(g);OGATE,P_SPINR(f)::QAR(E)+P(F),XP(g)
    • P(h);OGATE::R(H)+P(G),XP(h),EP
    • P(h);OGATE::R(H)+P(G),XP(h)
  • Tries
    • Try
      • R(D);XP(c)
      • Threat
        • QAB1(E)
      • Vars
        • R(f);CHECK,OGATE,P_SPINP(g)::QAR(E)+P(F),XR(f)
        • P(h);OGATE::R(H)+P(G),XP(h),EP
      • Refutation
        • R(f);P_SPINP(g),P_SPINR(f),XP(F)
    • Try
      • Q(E);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);CHECK,OGATE,P_SPINP(g)::R(D)+P(F),XR(f)
        • P(g);OGATE,P_SPINR(f)::R(D)+P(F),XP(g),EP
        • P(h);OGATE::R(H)+P(G),XP(h),EP
        • R(a);::QAB(E)
        • R(f);OGATE,P_SPINP(g)::R(D)+P(F),XR(f)
        • P(d);OGATE::QAB1(E)
      • Refutation
        • R(a);
    • Try
      • P(B);CHECK
      • Vars
        • P(d);EP,S_CUTR(a),XP(B)::QAR2(E)
      • Refutation
        • R(a);XP(B)
  • Actual
    • Q(E);P_PINP(d)
    • Threat
      • P(A)
    • Vars
      • R(f);CHECK,OGATE::R(D)+P(F),XR(f)
      • P(g);OGATE,P_SPINR(f)::R(D)+P(F),XP(g),EP
      • P(h);OGATE::R(H)+P(G),XP(h),EP
      • R(a);N_GUARD::P(B)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).