MESON Chess Problem Database

Problem Display
PID: 83733 (8/4p1Q1/3p4/BKN1r3/3kB3/1R6/1qpN2nn/1b2R3 w - - 0 1)

Ellerman, Arnoldo

Problemas, 1966

8/4p1Q1/3p4/BKN1r3/3kB3/1R6/1qpN2nn/1b2R3

#2

8 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Rd3#
    • 1...Qc1
      • 2.Bc3#
      • 2.Rd3#
    • 1...Qa3
      • 2.Bc3#
    • 1...Qc3
      • 2.Bxc3#
    • 1...Qa2
      • 2.Bc3#
      • 2.Rd3#
    • 1...Qxb3+
      • 2.Sxb3#
    • 1...Sxe1
      • 2.Qg1#
    • 1...Sf4
      • 2.Qg1#
    • 1...Sh4
      • 2.Qg1#
    • 1...Sf1
      • 2.Sf3#
    • 1...Sf3
      • 2.Sxf3#
    • 1...Sg4
      • 2.Sf3#
    • 1...d5
      • 2.Se6#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Se6#
      • 1...Qxb3+
        • 2.Scxb3#
      • 1...Sf4
        • 2.Qg1#
      • 1...e6
        • 2.Sxe6#
      • 1...dxc5!
    • 1.Qxe5+?
      • 1...dxe5
        • 2.Se6#
      • 1...Kxe5!
  • Keys
    • 1.Ka6!
      • threat
        • 2.Se6#
      • 1...Kxc5
        • 2.Bb6#
      • 1...Qxb3
        • 2.Scxb3#
      • 1...dxc5
        • 2.Rd3#
      • 1...Sf4
        • 2.Qg1#
      • 1...e6
        • 2.Sxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(b);N_PINR(C)::R1(C)
    • Q(b);N_GUARD,N_PINR(C)::B(E)
    • Q(b);N_GUARD,N_PINR(C)::B(E),XQ(b)
    • Q(b);CHECK,XR(C)::S(B),XQ(b)
    • S(d);OGATE,XR(A)::QAB(H)
    • S(d);OGATE::QAB(H)
    • S(e);N_GUARD::S(B)
    • S(e);N_GUARD::S(B),XS(e)
    • P(h);N_PINS(G)::S(G)
  • Tries
    • Try
      • K(F);N_SPINS(G),P-FLIGHT
      • Threat
        • S(G)
      • Vars
        • Q(b);CHECK,XR(C)::S(G),XQ(b)
        • S(d);OGATE::QAB(H)
        • P(i);::S(G),XP(i)
      • Refutation
        • P(h);XS(G)
    • Try
      • Q(H);CHECK,N_SPINS(G),XR(g)
      • Vars
        • P(h);SBLOCK,XQ(H)::S(G)
      • Refutation
        • K(f);S_FLIGHT,XQ(H)
  • Actual
    • K(F);N_SPINR(C),N_SPINS(G),S_FLIGHT
    • Threat
      • S(G)
    • Vars
      • K(f);N_SPINR(g),OGATEB,S_FLIGHT,XS(G)::B(E)
      • Q(b);XR(C)::S(G),XQ(b)
      • P(h);SBLOCK,XS(G)::R1(C)
      • S(d);OGATE::QAB(H)
      • P(i);::S(G),XP(i)
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