MESON Chess Problem Database

Problem Display
PID: 83507 (1r1b4/1B6/p6r/3pQ2p/K1kB4/1pp3R1/nq2p1bp/1N2n3 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1918

1r1b4/1B6/p6r/3pQ2p/K1kB4/1pp3R1/nq2p1bp/1N2n3

#2

6 + 15

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sa3#
    • 1...Qa3+
      • 2.Sxa3#
    • 1...Qc2
      • 2.Sa3#
    • 1...Qd2
      • 2.Sa3#
    • 1...Bf1
      • 2.Bxd5#
      • 2.Qxd5#
    • 1...Bh3
      • 2.Bxd5#
      • 2.Qxd5#
    • 1...Bb6
      • 2.Bxa6#
    • 1...c2
      • 2.Sd2#
  • Tries
    • 1.Bxa6+?
      • 1...Rb5
        • 2.Bxb5#
      • 1...Rxa6+!
  • Keys
    • 1.Bf2!
      • threat
        • 2.Qd4#
      • 1...Qa3+
        • 2.Sxa3#
      • 1...Sf3
        • 2.Qxd5#
      • 1...Qd2
        • 2.Sa3#
      • 1...Bb6
        • 2.Bxa6#
      • 1...Bf6
        • 2.Qc7#
      • 1...Sc2
        • 2.Qxe2#
      • 1...c2
        • 2.Sd2#
      • 1...d4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_GUARD::S(A)
    • Q(c);CHECK,N_GUARD::S(A),XQ(c)
    • B(o);S_CUTR(m),S_CUTR(n)::B(F),XP(l)
    • P(h);N_GUARD,S_CUTQ(c)::S(A)
  • Tries
    • Try
      • B(F);CHECK,XP(l)
      • Vars
        • R(n);N_GUARD,P_SPINR(n)::B(F),XR(n)
      • Refutation
        • R(m);CHECK,XB(F)
  • Actual
    • B(D);
    • Threat
      • QAR1(E)
    • Vars
      • Q(c);CHECK,N_GUARD::S(A),XQ(c)
      • S(a);S_CUTB(e)::QAB1(E),XP(j)
      • Q(c);N_GUARD::S(A)
      • B(o);S_CUTR(m),S_CUTR(n)::B(F),XP(l)
      • B(o);N_GUARD,S_CUTR(m)::QAR(E)
      • S(a);N_GUARD,S_CUTQ(c)::QAB(E),XP(d)
      • P(h);N_GUARD,S_CUTQ(c)::S(A)
      • P(j);::QAR1(E),XP(j)
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