MESON Chess Problem Database

Problem Display
PID: 84866 (8/bbqn1N2/p1B4B/p2n3r/4k1P1/1p1p1p2/1Q2N3/1K1R4 w - - 0 1)

Petite, Efren

Europe Echecs, 1962

8/bbqn1N2/p1B4B/p2n3r/4k1P1/1p1p1p2/1Q2N3/1K1R4

#2

8 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg3
      • 2.Sxg3#
    • 1...Qb6
      • 2.Sg3#
      • 2.Sd6#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qd8
      • 2.Sg3#
      • 2.Sd6#
    • 1...Qxc6
      • 2.Sg3#
    • 1...Qc8
      • 2.Sg3#
      • 2.Sd6#
    • 1...Re5
      • 2.Sg3#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bb8
      • 2.Qd4#
    • 1...Sc5
      • 2.Qd4#
    • 1...Se5
      • 2.Sg3#
    • 1...Sb6
      • 2.Qd4#
  • Tries
    • 1.Qc3?
      • threat
        • 2.Qxd3#
      • 1...dxe2
        • 2.Qd3#
      • 1...Sc5
        • 2.Qd4#
        • 2.Qc4#
      • 1...Se5
        • 2.Sg3#
      • 1...d2!
    • 1.Qxb3?
      • threat
        • 2.Qxd3#
      • 1...dxe2
        • 2.Qc2#
        • 2.Qd3#
      • 1...Sc5
        • 2.Qc4#
      • 1...Se5
        • 2.Qxd5#
      • 1...d2
        • 2.Qc2#
      • 1...Qb6!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxd3#
      • 1...dxe2
        • 2.Qd3#
      • 1...Sc5
        • 2.Qe3#
      • 1...Se5
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(k);N_GUARD::S(D),XQ(k)
    • Q(k);N_GUARD::S(H),XQ(k)
    • Q(k);N_GUARD,N_SPINS(f),XB(F)::S(D)
    • R(g);S_CUTQ(k)::S(D)
    • B(i);N_GUARD::QAR1(C),XB(i)
    • B(i);N_GUARD::QAR1(C)
    • S(l);S_CUTB(i)::QAR1(C)
    • S(l);S_CUTQ(k)::S(D)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • P(b);XS(D)::QAB1(C)
        • S(l);S_CUTQ(k)::S(D)
      • Refutation
        • P(b);
    • Try
      • Q(C);XP(a)
      • Threat
        • QAB1(C),XP(b)
      • Vars
        • S(l);S_CUTB(i)::QAR2(C)
        • S(l);S_CUTR(g)::QAB1(C),XS(f)
        • P(b);OGATEB::QAB(C)
      • Refutation
        • Q(k);P_PINQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XP(b)
    • Vars
      • P(b);XS(D)::QAB1(C)
      • S(l);S_CUTB(i)::QAR1(C)
      • S(l);S_CUTQ(k)::QAR1(C)
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