MESON Chess Problem Database

Problem Display
PID: 203489 (2N5/5Pb1/2p1P3/1pkpR3/5p1R/P1N1p1B1/BK2P3/6Q1 w - - 0 1)

Boros, Sandor

Nepszava, 1924

2N5/5Pb1/2p1P3/1pkpR3/5p1R/P1N1p1B1/BK2P3/6Q1

#2

12 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qxe3#
    • 1...fxg3
      • 2.Qxe3#
    • 1...f3
      • 2.Qxe3#
  • Tries
    • 1.Sa4+?
      • 1...Kd4
        • 2.Qxe3#
      • 1...bxa4!
    • 1.Bxf4?
      • threat
        • 2.Bxe3#
        • 2.Qxe3#
      • 1...Kd4
        • 2.Qxe3#
      • 1...Bh6
        • 2.Qxe3#
      • 1...Bxe5!
    • 1.f8Q+?
      • 1...Kd4
        • 2.Qxe3#
      • 1...Bxf8!
    • 1.f8B+?
      • 1...Kd4
        • 2.Qxe3#
      • 1...Bxf8!
  • Keys
    • 1.Rxe3!
      • threat
        • 2.Re5#
      • 1...Bxc3+
        • 2.Rxc3#
      • 1...Kd4
        • 2.Re4#
      • 1...fxe3
        • 2.Bd6#
      • 1...Bd4
        • 2.f8Q#
        • 2.f8B#
      • 1...Be5
        • 2.Rxe5#
      • 1...f3
        • 2.Bd6#
      • 1...d4
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(d);S_FLIGHT::QAB1(A),XP(a)
    • P(b);N_GUARD,XB(G)::QAB(A),XP(a)
    • P(b);N_GUARD::QAB(A),XP(a)
  • Tries
    • Try
      • S(F);CHECK,P_SPINR(I)
      • Vars
        • K(d);N_PINR(I),S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • P(c);XS(F)
    • Try
      • B(G);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • K(d);S_FLIGHT::QAB1(A),XP(a)
        • B(g);::QAB(A),XP(a)
      • Refutation
        • B(g);P_PINS(F),XR(I)
    • Try
      • P(K);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • B(g);XQ(K)
    • Try
      • P(K);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(A),XP(a)
      • Refutation
        • B(g);XB(K)
  • Actual
    • R(I);P_SPINS(F),XP(a)
    • Threat
      • QAB(A)+R(I)
    • Vars
      • B(g);CHECK,OGATE,XS(F)::QAB(A)+R(I),DCHECK,XB(g)
      • K(d);N_PINS(F),P_SPINP(b),S_FLIGHT::QAB(A)+R(I),DCHECK
      • P(b);OGATE,P_SPINP(b),XR(I)::B(G)
      • B(g);N_GUARD,SBLOCK::P=Q
      • B(g);::QAB(A)+R(I),XB(g)
      • P(b);OGATE::B(G)
      • P(e);N_PINS(F),SBLOCK::S(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).