MESON Chess Problem Database

Problem Display
PID: 168491 (3K4/2pN1bn1/4kP1b/1pP1N3/pP2P1n1/4p3/8/5Q2 w - - 0 1)

Petite, Efren

2nd HM., Suomen Shakki, 2003

3K4/2pN1bn1/4kP1b/1pP1N3/pP2P1n1/4p3/8/5Q2

#2

8 + 9

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe5
      • 2.Sf8#
    • 1...Sxf6
      • 2.Qxf6#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...Se8
      • 2.Qf5#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qd5#
      • 1...c6
        • 2.Qd6#
      • 1...Sxf6!
    • 1.Qxb5?
      • threat
        • 2.Qc4#
        • 2.Qc6#
      • 1...Sxf6
        • 2.Qc6#
      • 1...Sf5
        • 2.Qc4#
      • 1...Se8
        • 2.Qc4#
      • 1...c6
        • 2.Qc4#
        • 2.Qxc6#
      • 1...Sxe5!
    • 1.Qd1?
      • threat
        • 2.Qd5#
      • 1...c6
        • 2.Qd6#
      • 1...Sxf6!
    • 1.Qf4?
      • threat
        • 2.Sf8#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qxg4#
        • 2.Qf5#
      • 1...Se8
        • 2.Qxg4#
        • 2.Qf5#
      • 1...Bxf4!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa2#
      • 1...Sxe5
        • 2.Qxe5#
      • 1...Sxf6
        • 2.Sf8#

Anticipated by 23778(1996)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(c);SBLOCK,XS(E)::S(G)
    • S(c);OGATE,XP(F)::QAR1(A),XS(c)
    • S(i);N_GUARD::QAB1(A),XS(i)
    • S(i);N_GUARD::QAB1(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(g);N_GUARD::QAR1(A)
      • Refutation
        • S(c);XP(F)
    • Try
      • Q(A);XP(d)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);XP(F)::QAR2(A)
        • S(i);::QAB(A)
      • Refutation
        • S(c);XS(E)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • P(g);N_GUARD::QAR1(A)
      • Refutation
        • S(c);XP(F)
    • Try
      • Q(A);
      • Threat
        • S(G)
      • Vars
        • S(i);N_GUARD::QAB1(A),XS(i)
      • Refutation
        • B(f);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(c);OGATE,XS(E)::QAR1(A),XS(c)
      • S(c);SBLOCK,XP(F)::S(G)
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