MESON Chess Problem Database

Problem Display
PID: 63869 (B3n3/4P1b1/1p6/5R2/2k1p3/KR3qQr/Pp1PN3/1r6 w - - 0 1)

Ellerman, Arnoldo

Chess, 1946

B3n3/4P1b1/1p6/5R2/2k1p3/KR3qQr/Pp1PN3/1r6

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Rb4#
    • 1...Qxe2
      • 2.Rb4#
    • 1...Qg2
      • 2.Rb4#
    • 1...Qg4
      • 2.Rb4#
    • 1...Qh5
      • 2.Rb4#
    • 1...Qf1
      • 2.Rb4#
    • 1...Qf2
      • 2.Rb4#
    • 1...Qxb3+
      • 2.axb3#
    • 1...Qf4
      • 2.Rb4#
    • 1...Bd4
      • 2.Qg8#
    • 1...Bf6
      • 2.Qg8#
    • 1...Bh6
      • 2.Qg8#
    • 1...Bf8
      • 2.Qg8#
    • 1...Bh8
      • 2.Qg8#
    • 1...Sf6
      • 2.Qc7#
    • 1...Sc7
      • 2.Qxc7#
    • 1...e3
      • 2.d3#
  • Tries
    • 1.d3+?
      • 1...exd3
        • 2.Rb4#
      • 1...Qxd3!
  • Keys
    • 1.d4!
      • threat
        • 2.Bd5#
      • 1...Qxb3+
        • 2.axb3#
      • 1...Qxe2
        • 2.Rb4#
      • 1...Qxf5
        • 2.Rb4#
      • 1...Bxd4
        • 2.Qg8#
      • 1...exd4 ep
        • 2.Rb4#
      • 1...Be5
        • 2.Qg8#
      • 1...Sf6
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#
      • 1...e3
        • 2.Rc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(c);N_PINR(E)::R1(E)
    • Q(c);N_PINR(E),XS(C)::R1(E)
    • Q(c);CHECK,OGATE,XR(E)::P(A),XQ(c)
    • B(h);OGATE::QAB(F)
    • B(h);OGATE,P_PINP(H)::QAB(F)
    • S(i);N_GUARD::QAR(F)
    • S(i);N_GUARD::QAR(F),XS(i)
    • P(f);N_GUARD,N_PINR(E),S_CUTQ(c)::P(B)
  • Tries
    • Try
      • P(B);CHECK,N_SPINR(E)
      • Vars
        • P(f);SBLOCK,XP(B)::R1(E)
      • Refutation
        • Q(c);P_PINR(E),XP(B)
  • Actual
    • P(B);
    • Threat
      • B(I)
    • Vars
      • Q(c);CHECK,OGATE,XR(E)::P(A),XQ(c)
      • Q(c);N_PINR(E),XS(C)::R1(E)
      • Q(c);N_PINR(E),XR(G)::R1(E)
      • B(h);OGATE,XP(B)::QAB(F)
      • P(f);EP,N_PINR(E),XP(B)::R1(E)
      • B(h);OGATE::QAB(F)
      • S(i);N_GUARD::QAR(F)
      • S(i);N_GUARD::QAR(F),XS(i)
      • P(f);N_PINR(E),S_CUTQ(c)::R1(E)
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