MESON Chess Problem Database

Problem Display
PID: 83511 (5nB1/4QNqb/7b/n7/KNPkPB2/1PR3r1/1Pp2r2/8 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1919

5nB1/4QNqb/7b/n7/KNPkPB2/1PR3r1/1Pp2r2/8

#2

11 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Qxe5#
    • 1...Qg4
      • 2.Qe5#
    • 1...Qg6
      • 2.Qe5#
    • 1...Qxf7
      • 2.Qe5#
    • 1...Qxg8
      • 2.Qe5#
    • 1...Rf1
      • 2.Sxc2#
    • 1...Rff3
      • 2.Sxc2#
    • 1...Rxf4
      • 2.Sxc2#
    • 1...Rg1
      • 2.Rd3#
    • 1...Rg2
      • 2.Rd3#
    • 1...Rd3
      • 2.Rxd3#
    • 1...Rg4
      • 2.Rd3#
    • 1...Rg5
      • 2.Be3#
      • 2.Rd3#
    • 1...Rg6
      • 2.Rd3#
    • 1...Bxe4
      • 2.Qa7#
    • 1...Sxb3
      • 2.Sc6#
    • 1...Sxc4
      • 2.Sc6#
      • 2.Rxc4#
    • 1...Sc6
      • 2.Sxc6#
    • 1...Sb7
      • 2.Sc6#
  • Tries
    • 1.Be3+?
      • 1...Bxe3
        • 2.Rd3#
      • 1...Rxe3!
    • 1.Qf6+?
      • 1...Kxe4
        • 2.Sd6#
      • 1...Kc5
        • 2.Sa6#
        • 2.Qd6#
      • 1...Qxf6!
  • Keys
    • 1.Be5+!
      • 1...Kxe4
        • 2.Sd6#
      • 1...Qxe5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 16
  • Sets
    • Q(g);N_GUARD::QAB1(I),XQ(g)
    • Q(g);N_GUARD::QAB1(I)
    • Q(g);N_GUARD,XS(J)::QAB1(I)
    • Q(g);N_GUARD,XB(K)::QAB1(I)
    • R(b);N_GUARD::S(E),XP(a)
    • R(b);N_GUARD,XB(H)::S(E),XP(a)
    • R(c);N_GUARD::R1(C)
    • R(c);N_GUARD::R1(C),XR(c)
    • B(h);SBLOCK,XP(G)::QAB(I)
    • S(e);N_GUARD,XP(B)::S(E)
    • S(e);N_GUARD::S(E),XS(e)
    • S(e);N_GUARD::S(E)
  • Tries
    • Try
      • B(H);CHECK
      • Vars
        • B(f);XB(H)::R1(C)
      • Refutation
        • R(c);XB(H)
    • Try
      • Q(I);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(G)::S(J)
      • Refutation
        • Q(g);XQ(I)
  • Actual
    • B(H);CHECK
    • Vars
      • K(d);P-FLIGHT,XP(G)::S(J)
      • Q(g);OGATE,XB(H)::QAB1(I),XQ(g)
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Developed and maintained by Brian Stephenson.
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