MESON Chess Problem Database

Problem Display
PID: 139614 (8/1Q2pq2/5B2/2pBr3/3kNRn1/1ppP4/1P4N1/1b2K3 w - - 0 1)

Petite, Efren

Mat Plus, 1994

8/1Q2pq2/5B2/2pBr3/3kNRn1/1ppP4/1P4N1/1b2K3

#2

9 + 9

6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd3
      • 2.bxc3#
    • 1...Se3
      • 2.Sf2#
  • Tries
    • 1.Qxb3?
      • threat
        • 2.Qc4#
      • 1...Kxd3
        • 2.Qd1#
        • 2.Qxc3#
      • 1...Qxd5
        • 2.Qxc3#
      • 1...Bxd3
        • 2.bxc3#
      • 1...c4
        • 2.Qxc4#
      • 1...Se3
        • 2.Sf2#
      • 1...Ba2!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qc4#
      • 1...Kxd5
        • 2.Qd7#
      • 1...Qxd5
        • 2.bxc3#
      • 1...Bxd3
        • 2.Qxc5#
      • 1...Se3
        • 2.Sxc3#
      • 1...c4
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK,XP(D)::P(B),XP(c)
    • S(e);N_PINS(E)::R(F)+S(E)
  • Tries
    • Try
      • Q(I);XP(b)
      • Threat
        • QAR1(I)
      • Vars
        • Q(i);SBLOCK,XB(G)::QAB1(I),XP(c)
        • B(a);SBLOCK,XP(D)::P(B),XP(c)
        • P(f);::QAR1(I),XP(f)
        • S(e);N_PINS(E)::R(F)+S(E)
      • Refutation
        • B(a);
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • K(d);N_SPINR(g),OGATEB,P-FLIGHT,P_SPINP(f),XB(G)::QAR2(I)
      • Q(i);SBLOCK,XB(G)::P(B),XP(c)
      • B(a);SBLOCK,XP(D)::QAB1(I),XP(f)
      • S(e);N_PINS(E)::R(F)+S(E),XP(c)
      • P(f);::QAR1(I),XP(f)
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