MESON Chess Problem Database

Problem Display
PID: 219168 (n5Q1/3P3K/3pP2R/1Ppk1N1p/r1N4p/P4q2/2Pn4/B6B w - - 0 1)

Ellerman, Arnoldo

Freie Presse, 1970

n5Q1/3P3K/3pP2R/1Ppk1N1p/r1N4p/P4q2/2Pn4/B6B

#2

12 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Se3#
      • 2.e7#
    • 1...Rxc4
      • 2.Qxa8#
    • 1...Sxc4
      • 2.Bxf3#
    • 1...Se4
      • 2.e7#
  • Tries
    • 1.Bxf3+?
      • 1...Kxc4
        • 2.Sxd6#
      • 1...Se4
        • 2.Sce3#
        • 2.Sfe3#
        • 2.e7#
      • 1...Sxf3!
    • 1.Rxh5?
      • threat
        • 2.Sfxd6#
      • 1...Kxc4
        • 2.Sxd6#
      • 1...Rxc4
        • 2.Sg3#
      • 1...Sxc4
        • 2.Bxf3#
      • 1...Qe4
        • 2.Se3#
        • 2.e7#
      • 1...Se4
        • 2.Sfe3#
        • 2.e7#
      • 1...Ke4!
    • 1.Qxa8+?
      • 1...Kxc4
        • 2.Sxd6#
      • 1...Rxa8!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Sfxd6#
      • 1...Kxc4
        • 2.Sxd6#
      • 1...Ke4
        • 2.Sfxd6#
      • 1...Rxc4
        • 2.Sg3#
      • 1...Sxc4
        • 2.Bxf3#
      • 1...Qe4
        • 2.Se3#
      • 1...Se4
        • 2.Sfe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD,SBLOCK,XS(E)::QAB(L),XS(i)
    • S(a);N_GUARD,SBLOCK,XS(E)::B(B),XQ(b)
    • S(a);N_SPINQ(b),SBLOCK::QAB(L)+P(H)
  • Tries
    • Try
      • B(B);CHECK,XQ(b)
      • Vars
        • K(f);S_FLIGHT,XS(E)::S(G),XP(h)
      • Refutation
        • S(a);XB(B)
    • Try
      • R(I);XP(g)
      • Threat
        • R(I)+S(G),XP(h)
      • Vars
        • K(f);N_SPINQ(b),S_FLIGHT,XS(E)::S(G),XP(h)
        • R(c);SBLOCK,XS(E)::R(I)+S(G)
        • S(a);N_GUARD,SBLOCK,XS(E)::B(B),XQ(b)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(L);CHECK,XS(i)
      • Vars
        • K(f);N_SPINQ(b),S_FLIGHT,XS(E)::S(G),XP(h)
      • Refutation
        • R(c);XQ(L)
  • Actual
    • Q(L);
    • Threat
      • QAR(L)+S(G),XP(h)
    • Vars
      • K(f);N_SPINQ(b),S_FLIGHT,XS(E)::S(G),XP(h)
      • K(f);S_FLIGHT::S(G),XP(h)
      • R(c);SBLOCK,XS(E)::QAR(L)+S(G)
      • S(a);N_GUARD,SBLOCK,XS(E)::B(B),XQ(b)
      • Q(b);P_PINS(G)::S(E)
      • S(a);N_SPINQ(b),SBLOCK::QAR(L)+S(G),DCHECK
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