MESON Chess Problem Database

Problem Display
PID: 235616 (4N3/3p1P2/3r4/2p1k1NR/5pP1/pP2pP2/1R2Q2K/Bb6 w - - 0 1)

Ellerman, Arnoldo

Norsk Sjakkblad, 1936

4N3/3p1P2/3r4/2p1k1NR/5pP1/pP2pP2/1R2Q2K/Bb6

#2

11 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rd2#
    • 1...Rd1
      • 2.Rd2#
    • 1...Rd2
      • 2.Rxd2#
    • 1...Ra6
      • 2.Rd2#
    • 1...Rb6
      • 2.Rd2#
    • 1...Rc6
      • 2.Rd2#
    • 1...Re6
      • 2.Rd2#
    • 1...Rf6
      • 2.Rd2#
    • 1...Rg6
      • 2.Rd2#
    • 1...Rh6
      • 2.Rd2#
  • Tries
    • 1.Se4+?
      • 1...Kd4
        • 2.Rxb1#
        • 2.Ra2#
        • 2.Rc2#
        • 2.Rd2#
        • 2.Qc4#
      • 1...Ke6!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Qxd6#
      • 1...Rd2+
        • 2.Rxd2#
      • 1...Kd4
        • 2.Rd2#
      • 1...Kd5
        • 2.Qxd6#
      • 1...Rxa6
        • 2.Rd2#
      • 1...Rd1
        • 2.Rd2#
      • 1...Rd3
        • 2.Se6#
      • 1...Rd4
        • 2.Se4#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rb6
        • 2.Rd2#
      • 1...Rc6
        • 2.Rd2#
      • 1...Re6
        • 2.Rd2#
      • 1...Rf6
        • 2.Rd2#
      • 1...Rg6
        • 2.Rd2#
      • 1...Rh6
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(f);N_SPINP(c),S_FLIGHT::B(A)+R(B),DCHECK
    • R(g);N_GUARD::B(A)+R(B)
    • R(g);N_GUARD,P_PINQ(C)::B(A)+R(B),XR(g)
    • R(g);N_GUARD,P_PINR(I)::B(A)+R(B)
  • Tries
    • Try
      • S(H);CHECK,N_PINP(c)
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • Q(C);N_PINP(c)
    • Threat
      • QAB1(C),XR(g)
    • Vars
      • R(g);CHECK,N_GUARD::B(A)+R(B),XR(g)
      • K(f);S_FLIGHT::B(A)+R(B),DCHECK
      • K(f);P-FLIGHT::QAR1(C),XR(g)
      • R(g);N_GUARD,XQ(C)::B(A)+R(B)
      • R(g);N_GUARD::B(A)+R(B)
      • R(g);S_CUTB(a)::R(I)+S(H)
      • R(g);SBLOCK::R(I)+S(H)
      • R(g);OGATE,SBLOCK::QAB1(C)
      • R(g);N_GUARD,P_PINR(I)::B(A)+R(B)
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