MESON Chess Problem Database

Problem Display
PID: 107782 (3r4/2p5/4P3/1p1Q1p2/1BnPnK2/1B1k4/2R5/3N4 w - - 0 1)

Brabec, Juraj

Postsjakk, 1963

3r4/2p5/4P3/1p1Q1p2/1BnPnK2/1B1k4/2R5/3N4

#2

8 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Sxb2#
    • 1...Sa3
      • 2.Sb2#
    • 1...Se3
      • 2.Sb2#
    • 1...Sa5
      • 2.Sb2#
    • 1...Se5
      • 2.Sb2#
    • 1...Sb6
      • 2.Sb2#
    • 1...Scd6
      • 2.Sb2#
    • 1...Sf2
      • 2.Sxf2#
    • 1...Sc3
      • 2.Sf2#
    • 1...Sg3
      • 2.Sf2#
    • 1...Sc5
      • 2.Sf2#
    • 1...Sg5
      • 2.Sf2#
    • 1...Sed6
      • 2.Sf2#
    • 1...Sf6
      • 2.Sf2#
  • Tries
    • 1.Bxc4+?
      • 1...bxc4
        • 2.Qxc4#
      • 1...Kxc2!
    • 1.Qxf5?
      • threat
        • 2.Qxe4#
      • 1...Kxd4
        • 2.Qxe4#
      • 1...Rxd4
        • 2.Sf2#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Sd6
        • 2.Rd2#
      • 1...Rf8!
  • Keys
    • 1.Qxb5!
      • threat
        • 2.Qxc4#
      • 1...Kxd4
        • 2.Qxc4#
      • 1...Rxd4
        • 2.Sb2#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Sd6
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 13
  • Sets
    • S(b);N_GUARD::S(A),XS(b)
    • S(b);N_GUARD::S(A)
    • S(c);N_GUARD::S(A),XS(c)
    • S(c);N_GUARD::S(A)
  • Tries
    • Try
      • B(C);CHECK,XS(b)
      • Vars
        • P(d);OGATE,XB(C)::QAB1(G),XP(d)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • Q(G);P_PINS(c),XP(e)
      • Threat
        • QAB1(G),XS(c)
      • Vars
        • K(a);N_SPINS(c),P-FLIGHT,XP(E)::QAR1(G),XS(c)
        • R(g);SBLOCK,XP(E)::S(A)
        • S(b);N_GUARD::R1(B),XS(b)
        • S(b);N_GUARD::R1(B)
      • Refutation
        • R(g);P_PINQ(G)
  • Actual
    • Q(G);P_PINS(b),XP(d)
    • Threat
      • QAB1(G),XS(b)
    • Vars
      • K(a);N_SPINS(b),P-FLIGHT,XP(E)::QAR1(G),XS(b)
      • R(g);SBLOCK,XP(E)::S(A)
      • S(c);N_GUARD::R1(B),XS(c)
      • S(c);N_GUARD::R1(B)
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