MESON Chess Problem Database

Problem Display
PID: 245077 (7B/3bQ3/3p4/r7/ppBR3b/2kP3R/Pp4r1/1K3N1n w - - 0 1)

Ellerman, Arnoldo

Schackvarlden, 1935

7B/3bQ3/3p4/r7/ppBR3b/2kP3R/Pp4r1/1K3N1n

#2

9 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.Qe1#
    • 1...Sf2
      • 2.Qe1#
  • Tries
    • 1.Rdxh4+?
      • 1...Rg7
        • 2.Qe1#
      • 1...Re5!
    • 1.Rd5+?
      • 1...Bf6
        • 2.Bxf6#
        • 2.Qxf6#
      • 1...Rg7!
    • 1.Qe1+?
      • 1...Rd2
        • 2.Qxd2#
      • 1...Bxe1!
  • Keys
    • 1.Bb5!
      • threat
        • 2.Rc4#
      • 1...Bxh3
        • 2.Qc7#
      • 1...Rg3
        • 2.Qe1#
      • 1...Bg3
        • 2.Rf4#
      • 1...Sg3
        • 2.Rdxh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD,S_CUTB(g)::QAB(H)
    • S(a);S_CUTB(g),S_CUTR(c)::QAB(H)
  • Tries
    • Try
      • R(G);CHECK,XB(g)
      • Vars
        • R(c);P_SPINR(c)::QAB(H)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • R(G);CHECK
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(H);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB1(H),XR(c)
      • Refutation
        • B(g);XQ(H)
  • Actual
    • B(F);
    • Threat
      • B(I)+R(G),DCHECK
    • Vars
      • B(j);OGATE,XR(E)::QAR(H)
      • R(c);N_GUARD,S_CUTB(g)::QAB(H)
      • B(g);N_GUARD,S_CUTR(c)::B(I)+R(G)
      • S(a);S_CUTR(c)::B(I)+R(G),XB(g)
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