MESON Chess Problem Database

Problem Display
PID: 204513 (b7/4Q3/3pP1P1/N2k1BR1/5p2/1NB5/K1P1q3/8 w - - 0 1)

Ellerman, Arnoldo

Magyar Sakkvilag, 1925

b7/4Q3/3pP1P1/N2k1BR1/5p2/1NB5/K1P1q3/8

#2

10 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Bd3#
    • 1...Qf1
      • 2.Bd3#
    • 1...Qd3
      • 2.Bxd3#
    • 1...Qf3
      • 2.Bd3#
    • 1...Qc4
      • 2.Bd3#
    • 1...Qb5
      • 2.Bd3#
    • 1...Qa6
      • 2.Bd3#
    • 1...Qxc2+
      • 2.Bxc2#
    • 1...Qd2
      • 2.Bd3#
    • 1...Qf2
      • 2.Bd3#
    • 1...Qh2
      • 2.Bd3#
    • 1...Qxe6
      • 2.Qxe6#
    • 1...Bb7
      • 2.Qxb7#
  • Tries
    • 1.Bg4+?
      • 1...Qe5
        • 2.Bf3#
      • 1...Ke4!
    • 1.Qe8?
      • threat
        • 2.Qxa8#
      • 1...Qxc2+
        • 2.Bxc2#
      • 1...Qc4
        • 2.Bd3#
      • 1...Qb5
        • 2.Bd3#
        • 2.Qxb5#
      • 1...Qa6
        • 2.Bd3#
      • 1...Bc6
        • 2.Qxc6#
      • 1...Bb7!
  • Keys
    • 1.Bb4!
      • threat
        • 2.Qxd6#
      • 1...Qxc2+
        • 2.Bxc2#
      • 1...Ke5
        • 2.Bd3#
      • 1...Qxe6
        • 2.Qxe6#
      • 1...Qa6
        • 2.Bd3#
      • 1...Qe5
        • 2.c4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(a);N_GUARD,N_PINP(B)::R(G)+B(F)
    • Q(a);N_GUARD,N_PINP(B)::R(G)+B(F),XQ(a)
    • Q(a);N_GUARD,N_PINP(B),P_PINS(C)::R(G)+B(F)
    • Q(a);N_GUARD,N_PINP(B),P_PINS(E)::R(G)+B(F)
    • Q(a);CHECK,OGATE,XP(B)::R(G)+B(F),XQ(a)
    • Q(a);N_GUARD::R(G)+B(F)
    • Q(a);N_PINP(B),OGATE,XP(H)::QAB1(J),XQ(a)
    • B(e);N_GUARD::QAB(J),XB(e)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • Q(a);N_PINP(B),P_SPINQ(a)::B(F)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(J);
      • Threat
        • QAB(J),XB(e)
      • Vars
        • Q(a);CHECK,OGATE,XP(B)::R(G)+B(F),XQ(a)
        • Q(a);N_GUARD,N_PINP(B),P_PINS(C)::R(G)+B(F)
        • Q(a);N_GUARD,N_PINP(B),P_PINS(E)::R(G)+B(F)
        • B(e);N_GUARD::QAB1(J),XB(e)
      • Refutation
        • B(e);
  • Actual
    • B(D);
    • Threat
      • QAR1(J),XP(d)
    • Vars
      • Q(a);CHECK,OGATE,XP(B)::R(G)+B(F),XQ(a)
      • K(c);P-FLIGHT::R(G)+B(F)
      • Q(a);N_PINP(B),OGATE,XP(H)::QAB1(J),XQ(a)
      • Q(a);N_GUARD,N_PINP(B),P_PINS(E)::R(G)+B(F)
      • Q(a);N_PINP(B),SBLOCK::P(B)
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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).