MESON Chess Problem Database

Problem Display
PID: 186130 (K6B/1Q6/p7/2k2N2/r1P2r2/1p6/1nRn4/2N5 w - - 0 1)

Lertoria, Ernest

Chess, 1959

K6B/1Q6/p7/2k2N2/r1P2r2/1p6/1nRn4/2N5

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4
      • 2.Qc7#
    • 1...Rf1
      • 2.Bd4#
    • 1...Rf2
      • 2.Bd4#
    • 1...Rf3
      • 2.Bd4#
    • 1...Rxc4
      • 2.Bd4#
    • 1...Rd4
      • 2.Bxd4#
    • 1...Sd1
      • 2.Sd3#
    • 1...Sd3
      • 2.Sxd3#
    • 1...Sbxc4
      • 2.Sd3#
    • 1...Sb1
      • 2.Sxb3#
    • 1...Sf1
      • 2.Sxb3#
    • 1...Sf3
      • 2.Sxb3#
    • 1...Sdxc4
      • 2.Sxb3#
    • 1...Se4
      • 2.Sxb3#
      • 2.Bd4#
    • 1...a5
      • 2.Qb5#
  • Tries
    • 1.Qe7+?
      • 1...Kc6
        • 2.Qd6#
      • 1...Kb6!
  • Keys
    • 1.Bc3!
      • threat
        • 2.Qc7#
      • 1...Kxc4
        • 2.Qc6#
      • 1...Raxc4
        • 2.Bb4#
      • 1...Rfxc4
        • 2.Bd4#
      • 1...Sbxc4
        • 2.Sd3#
      • 1...Sdxc4
        • 2.Sxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 11
  • Sets
    • R(d);SBLOCK::QAR2(E)
    • R(e);N_GUARD::B(G)
    • R(e);N_GUARD,P_SPINR(e),XP(C)::B(G)
    • R(e);N_GUARD::B(G),XR(e)
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(a);N_GUARD,P_SPINS(a),XP(C)::S(A)
    • S(b);N_GUARD::S(A),XP(c)
    • S(b);N_GUARD,P_SPINS(b),XP(C)::S(A),XP(c)
    • P(g);N_GUARD::QAR1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);P-FLIGHT::QAR1(E)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • B(G);
    • Threat
      • QAR2(E)
    • Vars
      • K(f);P-FLIGHT,XP(C)::QAR2(E)
      • R(d);N_GUARD,XP(C)::B(G)
      • R(e);N_GUARD,XP(C)::B(G)
      • S(a);N_GUARD,SBLOCK,XP(C)::S(A)
      • S(b);N_GUARD,SBLOCK,XP(C)::S(A),XP(c)
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