MESON Chess Problem Database

Problem Display
PID: 83688 (4Q3/6N1/p2p2N1/3p2p1/3PP1rn/4knp1/2PR2BB/3K2b1 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1969

4Q3/6N1/p2p2N1/3p2p1/3PP1rn/4knp1/2PR2BB/3K2b1

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bf2
      • 2.Rd3#
    • 1...Se1
      • 2.Bxg1#
    • 1...Sxd2
      • 2.Bxg1#
    • 1...Sxd4
      • 2.Bxg1#
    • 1...Se5
      • 2.Bxg1#
    • 1...Sxg2
      • 2.Sf5#
    • 1...Sf5
      • 2.Sxf5#
  • Tries
    • 1.Se7?
      • threat
        • 2.Sxd5#
      • 1...Kxe4
        • 2.Sg6#
      • 1...Kf4
        • 2.Sxd5#
      • 1...dxe4
        • 2.Sd5#
      • 1...Sxd2!
    • 1.Qa4?
      • threat
        • 2.Re2#
      • 1...Kxe4
        • 2.Qe8#
      • 1...Sxd2
        • 2.Bxg1#
      • 1...Sxd4
        • 2.Bxg1#
        • 2.Qxd4#
      • 1...Sxg6!
    • 1.Qe5?
      • threat
        • 2.Re2#
      • 1...Sxd2
        • 2.Bxg1#
      • 1...Sxd4
        • 2.Bxg1#
        • 2.Qxd4#
      • 1...Sxe5
        • 2.Bxg1#
      • 1...dxe5!
    • 1.exd5+?
      • 1...Se5
        • 2.Bxg1#
      • 1...Re4!
  • Keys
    • 1.Se6!
      • threat
        • 2.Re2#
      • 1...Kxe4
        • 2.Sg7#
      • 1...Sxd2
        • 2.Bxg1#
      • 1...Sxd4
        • 2.Bxg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • B(a);SBLOCK::R1(C)
    • S(c);N_GUARD::B(E),XB(a)
    • S(c);N_GUARD,XR(C)::B(E),XB(a)
    • S(c);N_GUARD,XP(F)::B(E),XB(a)
    • S(f);N_GUARD,XB(D)::S(I)
    • S(f);N_GUARD::S(I),XS(f)
  • Tries
    • Try
      • S(H);
      • Threat
        • S(H),XP(g)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(c),XP(G)::QAR(J)+S(H)
        • K(b);P_SPINP(d),S_FLIGHT::S(H),XP(g)
        • P(g);XP(G)::S(H)
      • Refutation
        • S(c);XR(C)
    • Try
      • Q(J);
      • Threat
        • R1(C)
      • Vars
        • K(b);OGATEB,P-FLIGHT,P_SPINS(c),XP(G)::QAR(J)
        • S(c);N_GUARD,XR(C)::B(E),XB(a)
      • Refutation
        • S(f);XS(H)
    • Try
      • Q(J);
      • Threat
        • R1(C)
      • Vars
        • S(c);N_GUARD,XR(C)::B(E),XB(a)
        • S(c);N_GUARD,XQ(J)::B(E),XB(a)
      • Refutation
        • P(j);XQ(J)
    • Try
      • P(G);CHECK,XP(g)
      • Vars
        • S(c);P_SPINS(c)::B(E),XB(a)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • S(I);
    • Threat
      • R1(C)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(c),XP(G)::QAR(J)+S(I)
      • S(c);N_GUARD,XR(C)::B(E),XB(a)
      • S(c);N_GUARD,XP(F)::B(E),XB(a)
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