MESON Chess Problem Database

Problem Display
PID: 246452 (6K1/3p2pQ/1R1B1PP1/3k1B1p/1pN2PP1/p2P4/2N5/qnb5 w - - 0 1)

Petite, Efren

Europe Echecs, 1993

6K1/3p2pQ/1R1B1PP1/3k1B1p/1pN2PP1/p2P4/2N5/qnb5

#2

12 + 9

145 StrateGems 2007
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sxb4#
    • 1...Bb2
      • 2.S4e3#
    • 1...Be3
      • 2.S4xe3#
    • 1...Sd2
      • 2.S4e3#
    • 1...hxg4
      • 2.Qh1#
    • 1...gxf6
      • 2.Qf7#
  • Tries
    • 1.Bxb4?
      • threat
        • 2.Be4#
        • 2.Rd6#
      • 1...Qxf6
        • 2.Be4#
      • 1...Bxf4
        • 2.Be4#
      • 1...Qd4
        • 2.Rd6#
      • 1...Sd2
        • 2.S4e3#
        • 2.Rd6#
      • 1...Sc3
        • 2.Rd6#
      • 1...d6
        • 2.Rxd6#
      • 1...Qe5!
    • 1.Qxh5?
      • threat
        • 2.Qh1#
      • 1...Qd4
        • 2.Sxb4#
      • 1...Sd2
        • 2.S4e3#
      • 1...Sc3
        • 2.Bxd7#
      • 1...Qe5!
  • Keys
    • 1.Bxd7!
      • threat
        • 2.Rb5#
      • 1...Qd4
        • 2.Sxb4#
      • 1...Be3
        • 2.S4xe3#
      • 1...Sc3
        • 2.Qxh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • Q(a);SBLOCK::S(A),XP(e)
    • B(c);N_GUARD::S(C)
    • B(c);N_GUARD::S(C),XB(c)
    • S(b);S_CUTB(c)::S(C)
    • P(g);OGATE,XP(E)::QAB(K)
    • P(i);OGATE,XP(I)::QAB(K)
  • Tries
    • Try
      • B(H);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);XP(I)::B(F)
        • B(c);XP(D)::B(F)
        • Q(a);::R1(G)
        • S(b);::R1(G)
        • P(h);::R1(G),XP(h)
      • Refutation
        • Q(a);
    • Try
      • Q(K);XP(g)
      • Threat
        • QAB(K)
      • Vars
        • Q(a);SBLOCK::S(A),XP(e)
        • S(b);S_CUTB(c)::S(C)
        • S(b);S_CUTQ(a)::QAR(K)+B(F),XP(h)
      • Refutation
        • Q(a);
  • Actual
    • B(F);XP(h)
    • Threat
      • R(G)
    • Vars
      • Q(a);SBLOCK::S(A),XP(e)
      • B(c);N_GUARD::S(C),XB(c)
      • S(b);S_CUTQ(a)::QAR(K),XP(g)
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