MESON Chess Problem Database

Problem Display
PID: 168261 (Q2K4/pNB5/5R2/P1pp4/2PkP3/P1pqN3/3P1P2/1BR5 w - - 0 1)

Petite, Efren

Problem (Zagreb), 1961

Q2K4/pNB5/5R2/P1pp4/2PkP3/P1pqN3/3P1P2/1BR5

#2

14 + 6

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Rf4#
    • 1...Qf1
      • 2.dxc3#
    • 1...Qe2
      • 2.dxc3#
    • 1...Qxc4
      • 2.Sf5#
    • 1...Qxe4
      • 2.dxc3#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qxd5#
      • 1...Qxc4
        • 2.Sdf5#
      • 1...Qxe4
        • 2.Sb5#
      • 1...dxc4
        • 2.Sb5#
        • 2.Sdf5#
        • 2.Qd5#
      • 1...dxe4
        • 2.Sb5#
        • 2.Sdf5#
        • 2.Qd5#
      • 1...Ke5!
    • 1.dxc3+?
      • 1...Kxe4
        • 2.Sxc5#
        • 2.Rf4#
      • 1...Qxc3!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qxa7#
      • 1...Qxc4
        • 2.Se6#
      • 1...Qxe4
        • 2.Sb3#
      • 1...dxc4
        • 2.Se6#
        • 2.Qd5#
      • 1...dxe4
        • 2.Sb3#
        • 2.Se6#
        • 2.Qd5#

This anticipates 168391(2002)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(c);OGATEB,P-FLIGHT,P_SPINQ(b),XP(H)::R1(J)
    • Q(b);N_GUARD::P(C),XP(a)
    • Q(b);SBLOCK,XP(G)::S(F)
    • Q(b);N_GUARD,XP(H)::P(C),XP(a)
  • Tries
    • Try
      • S(K);
      • Threat
        • QAR1(M),XP(e)
      • Vars
        • Q(b);XP(G)::S(K)
        • Q(b);XP(H)::S(K)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(C);CHECK,XP(a)
      • Refutation
        • Q(b);XP(C)
  • Actual
    • S(K);XP(d)
    • Threat
      • QAR1(M),XP(e)
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(K)::QAB(M),XP(f)
      • Q(b);XP(G)::S(K)
      • Q(b);XP(H)::S(K)
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