MESON Chess Problem Database

Problem Display
PID: 139217 (N2kB2R/Q1pppR2/2p3P1/8/8/1q3p2/7b/6nK w - - 0 1)

Ellerman, Arnoldo

Caissa, 1943

N2kB2R/Q1pppR2/2p3P1/8/8/1q3p2/7b/6nK

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Qb8#
    • 1...Qa2
      • 2.Qb8#
    • 1...Qc2
      • 2.Qb8#
    • 1...Qa4
      • 2.Qb8#
    • 1...Qc4
      • 2.Qb8#
    • 1...Qd5
      • 2.Qb8#
    • 1...Qe6
      • 2.Qb8#
    • 1...Qxf7
      • 2.Bxf7#
      • 2.Qb8#
    • 1...Qa3
      • 2.Qb8#
    • 1...Qc3
      • 2.Qb8#
    • 1...Qd3
      • 2.Qb8#
    • 1...Qe3
      • 2.Qb8#
    • 1...Qb8
      • 2.Qxb8#
    • 1...d5
      • 2.Bxc6#
    • 1...d6
      • 2.Bxc6#
      • 2.Qxc7#
    • 1...e5
      • 2.Bxd7#
      • 2.Qxc7#
    • 1...e6
      • 2.Bxd7#
  • Tries
    • 1.Sb6?
      • threat
        • 2.Bxd7#
        • 2.Qb8#
        • 2.Qa8#
      • 1...Qxf7
        • 2.Bxf7#
        • 2.Qb8#
        • 2.Qa8#
      • 1...cxb6
        • 2.Bxd7#
        • 2.Qxd7#
      • 1...Qa2
        • 2.Bxd7#
        • 2.Qb8#
      • 1...Qa4
        • 2.Bxd7#
        • 2.Qb8#
      • 1...Qb2
        • 2.Qb8#
        • 2.Qa8#
      • 1...Qa3
        • 2.Bxd7#
        • 2.Qb8#
      • 1...Qc3
        • 2.Qb8#
        • 2.Qa8#
      • 1...Be5
        • 2.Qb8#
        • 2.Qa8#
      • 1...d5
        • 2.Bxc6#
        • 2.Bd7#
        • 2.Qb8#
        • 2.Qa8#
      • 1...d6
        • 2.Bxc6#
        • 2.Bd7#
        • 2.Qb8#
        • 2.Qa8#
      • 1...Qxb6!
  • Keys
    • 1.Rg7!
      • threat
        • 2.Bf7#
      • 1...Kc8
        • 2.Bf7#
      • 1...Qg8
        • 2.Qb8#
      • 1...Qf7
        • 2.Bxf7#
        • 2.Qb8#
      • 1...d5
        • 2.Bxc6#
      • 1...d6
        • 2.Qxc7#
      • 1...e5
        • 2.Qxc7#
      • 1...e6
        • 2.Bxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 12
  • Sets
    • Q(c);N_GUARD::QAR2(C)
    • Q(c);N_GUARD::QAR2(C),XQ(c)
    • P(g);OGATE::R(G)+B(F),XP(e)
    • P(h);::R(G)+B(F),XP(g)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Refutation
        • Q(c);XS(E)
  • Actual
    • R(D);
    • Threat
      • R(G)+B(F)
    • Vars
      • K(i);P-FLIGHT::R(G)+B(F)
      • Q(c);N_GUARD::QAR2(C)
      • P(g);OGATE::R(G)+B(F),XP(e)
      • P(g);S_CUTB(b)::QAB1(C),XP(f)
      • P(h);S_CUTB(b)::QAB1(C),XP(f)
      • P(h);S_CUTQ(c)::R(G)+B(F),XP(g)
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