MESON Chess Problem Database

Problem Display
PID: 246447 (nK3R1b/1Q1B3b/2p3p1/2P1k1N1/5NP1/2ppPp2/5r2/3r4 w - - 0 1)

Petite, Efren

Europe Echecs, 1990

nK3R1b/1Q1B3b/2p3p1/2P1k1N1/5NP1/2ppPp2/5r2/3r4

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
    • 1...c2
      • 2.Qb2#
  • Tries
    • 1.Sxd3+?
      • 1...Kd5
        • 2.Be6#
        • 2.Qb3#
      • 1...Rxd3!
    • 1.Qb3?
      • threat
        • 2.Qe6#
        • 2.Qxc3#
      • 1...Rb1
        • 2.Sxd3#
      • 1...Rc1
        • 2.Sxd3#
        • 2.Qe6#
      • 1...Rc2
        • 2.Qe6#
      • 1...Bg8
        • 2.Sxg6#
        • 2.Qxc3#
      • 1...Sc7
        • 2.Qxc3#
      • 1...c2
        • 2.Qe6#
        • 2.Qb2#
        • 2.Qc3#
      • 1...Rb2!
    • 1.Qb4?
      • threat
        • 2.Qxc3#
        • 2.Qd4#
        • 2.Qe4#
      • 1...Rc1
        • 2.Qd4#
        • 2.Qe4#
      • 1...Rb2
        • 2.Sxf3#
      • 1...Rc2
        • 2.Sxf3#
        • 2.Qd4#
        • 2.Qe4#
      • 1...c2
        • 2.Qc3#
        • 2.Qb2#
        • 2.Qd4#
        • 2.Qe4#
      • 1...Rb1!
  • Keys
    • 1.Bxc6!
      • threat
        • 2.Qe7#
      • 1...Rb1
        • 2.Sxd3#
      • 1...Rb2
        • 2.Sxf3#
      • 1...Bg8
        • 2.Sxg6#
      • 1...Bf6
        • 2.Sf7#
      • 1...Sc7
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(j);N_GUARD::QAB(F)
    • S(j);N_GUARD::QAB(F),XS(j)
    • P(c);OGATEB::QAB(F)
  • Tries
    • Try
      • S(B);CHECK,XP(d)
      • Refutation
        • R(a);XS(B)
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_GUARD,P_PINQ(F)::S(B),XP(d)
        • R(b);::QAR1(F)
        • S(j);::QAB(F),XP(c)
      • Refutation
        • R(b);P_PINQ(F)
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);N_GUARD,P_PINQ(F)::S(E),XP(e)
      • Refutation
        • R(a);P_PINQ(F)
  • Actual
    • B(G);XP(g)
    • Threat
      • QAR2(F)
    • Vars
      • R(a);N_GUARD,P_PINQ(F)::S(B),XP(d)
      • R(b);N_GUARD,P_PINQ(F)::S(E),XP(e)
      • B(i);N_GUARD::S(B),XP(h)
      • B(k);SBLOCK::S(E)
      • S(j);N_GUARD::QAB(F),XS(j)
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