MESON Chess Problem Database

Problem Display
PID: 106272 (2b5/2Q5/p7/1NB2p1K/1pP1kp2/R1b2n1R/2Pp4/3n3N w - - 0 1)

Pituk, Alexander

Praca, 1948

2b5/2Q5/p7/1NB2p1K/1pP1kp2/R1b2n1R/2Pp4/3n3N

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qc6#
    • 1...Sb2
      • 2.Sf2#
    • 1...Sf2
      • 2.Sxf2#
    • 1...Se3
      • 2.Sf2#
    • 1...Se5
      • 2.Sd6#
  • Tries
    • 1.Sxc3+?
      • 1...Sxc3
        • 2.Sf2#
      • 1...bxc3!
    • 1.Rxf3?
      • threat
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Be5
        • 2.Qc6#
      • 1...Kxf3!
    • 1.Qe7+?
      • 1...Be5
        • 2.Sd6#
      • 1...Se5
        • 2.Sd6#
      • 1...Be6!
  • Keys
    • 1.Be3!
      • threat
        • 2.Qxf4#
      • 1...Kxe3
        • 2.Qe5#
      • 1...Sxe3
        • 2.Sf2#
      • 1...fxe3
        • 2.Sg3#
      • 1...Be5
        • 2.Qc6#
      • 1...Se5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(c);SBLOCK::QAB(I)
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(d);SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK,XB(c)
      • Vars
        • S(a);XS(F)::S(A)
      • Refutation
        • P(e);XS(F)
    • Try
      • R(D);XS(d)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);SBLOCK::QAB(I)
      • Refutation
        • K(f);P_SPINB(c),S_FLIGHT,XR(D)
    • Try
      • Q(I);CHECK
      • Vars
        • B(c);P_SPINB(c)::S(F)
        • S(d);P_SPINS(d)::S(F)
      • Refutation
        • B(j);P_SPINB(j)
  • Actual
    • B(G);
    • Threat
      • QAR1(I),XP(g)
    • Vars
      • K(f);P-FLIGHT,P_SPINB(c),P_SPINS(d),XB(G)::QAR2(I)
      • S(a);N_GUARD,SBLOCK,XB(G)::S(A)
      • P(g);N_GUARD,SBLOCK,XB(G)::S(A)
      • B(c);SBLOCK::QAB(I)
      • S(d);SBLOCK::S(F)
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