MESON Chess Problem Database

Problem Display
PID: 238909 (2nN4/2R1q3/5p2/3b2R1/2PkB2B/QPn5/p2P4/K3N3 w - - 0 1)

Petite, Efren

Norsk Sjakkblad, 1958

2nN4/2R1q3/5p2/3b2R1/2PkB2B/QPn5/p2P4/K3N3

#2

11 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qc5#
    • 1...Bxc4
      • 2.Rxc4#
    • 1...Bxe4
      • 2.Bf2#
    • 1...Sxe4
      • 2.Rxd5#
  • Tries
    • 1.Qc5+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...Qxc5!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Sf3#
      • 1...Ke5
        • 2.Sf3#
      • 1...Qxe4
        • 2.Bxf6#
      • 1...Bxe4
        • 2.Sc6#
      • 1...Sxe4
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(f);N_GUARD,SBLOCK,XB(G)::QAB1(D)
    • B(d);OGATE,XP(F)::R1(J),XB(d)
    • B(d);SBLOCK,XB(G)::B(H)
    • S(b);N_GUARD,SBLOCK,XB(G)::R1(I),XB(d)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT,XB(G)::QAR1(D)
      • Refutation
        • Q(f);XQ(D)
  • Actual
    • R(I);
    • Threat
      • S(B)
    • Vars
      • K(c);S_FLIGHT::S(B)
      • Q(f);N_GUARD,P_SPINQ(f),XB(G)::B(H),XP(e)
      • B(d);N_GUARD,P_SPINB(d),XB(G)::S(K)
      • S(b);OGATEB,P_SPINS(b),XB(G)::QAB(D)
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