MESON Chess Problem Database

Problem Display
PID: 83626 (4R3/5p1r/5Q2/K3B1r1/1p1p3p/1Nb3pb/1pB1k3/3N2R1 w - - 0 1)

Ellerman, Arnoldo

Sahovski Glasnik, 1933

4R3/5p1r/5Q2/K3B1r1/1p1p3p/1Nb3pb/1pB1k3/3N2R1

#2

8 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe5+
      • 2.Rxe5#
    • 1...Bd2
      • 2.Sxd4#
    • 1...Bf1
      • 2.Qxf1#
    • 1...Bg4
      • 2.Qf1#
    • 1...Be6
      • 2.Qf1#
    • 1...Bd7
      • 2.Qf1#
    • 1...Bc8
      • 2.Qf1#
    • 1...g2
      • 2.Qf2#
  • Tries
    • 1.Sxd4+?
      • 1...Kd2
        • 2.Qxg5#
        • 2.Qf4#
      • 1...Bxd4!
    • 1.Qf4?
      • threat
        • 2.Qe4#
      • 1...Rxe5+
        • 2.Rxe5#
      • 1...Rg4
        • 2.Bxd4#
        • 2.Bd6#
        • 2.Bf6#
        • 2.Bc7#
        • 2.Bg7#
        • 2.Bb8#
        • 2.Bh8#
      • 1...Bd2
        • 2.Sxd4#
      • 1...Bf5
        • 2.Qf1#
      • 1...f5
        • 2.Bg7#
      • 1...Bg2!
    • 1.Qa6+?
      • 1...d3
        • 2.Qxd3#
      • 1...Kf3!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qe4#
      • 1...Rxe5+
        • 2.Rxe5#
      • 1...Rg4
        • 2.Bf4#
      • 1...Bd2
        • 2.Sxd4#
      • 1...Bg2
        • 2.Qxg2#
      • 1...Bf5
        • 2.Qg2#
      • 1...f5
        • 2.Bg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(i);CHECK,OGATE,P_SPINR(i),XB(F)::R(H),XR(i)
    • B(c);N_GUARD,SBLOCK::S(D),XP(g)
    • B(e);N_GUARD::QAB1(G),XB(e)
    • B(e);N_GUARD::QAB1(G)
    • P(d);N_GUARD::QAR1(G)
  • Tries
    • Try
      • S(D);CHECK,XP(g)
      • Refutation
        • B(c);XS(D)
    • Try
      • Q(G);
      • Threat
        • QAR2(G)
      • Vars
        • R(i);CHECK,OGATE,P_SPINR(i),XB(F)::R(H),XR(i)
        • B(c);N_GUARD::S(D),XP(g)
        • B(e);N_GUARD,N_PINB(F)::QAB1(G)
        • P(j);N_PINB(F)::R(H)+B(F)
      • Refutation
        • B(e);
    • Try
      • Q(G);CHECK
      • Vars
        • P(g);P_SPINP(g)::QAB1(G),XP(g)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(G);
    • Threat
      • QAR2(G)
    • Vars
      • R(i);CHECK,OGATE,P_SPINR(i),XB(F)::R(H),XR(i)
      • R(i);N_PINB(F)::R(H)+B(F)
      • B(c);N_GUARD,SBLOCK::S(D),XP(g)
      • B(e);N_GUARD::QAR2(G),XB(e)
      • B(e);N_GUARD,N_PINB(F)::QAR2(G)
      • P(j);N_PINB(F)::R(H)+B(F)
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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).