MESON Chess Problem Database

Problem Display
PID: 244468 (8/3Pr3/Np3Q2/4pnRB/2Pnk3/r2p2PK/8/1NB5 w - - 0 1)

Eerkes, Allard Pieter

Parallele 50, 1948

8/3Pr3/Np3Q2/4pnRB/2Pnk3/r2p2PK/8/1NB5

#2

10 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Sc3#
    • 1...Ra2
      • 2.Sc3#
    • 1...Rc3
      • 2.Sxc3#
    • 1...Ra4
      • 2.Sc3#
    • 1...Ra5
      • 2.Sc3#
    • 1...Rxa6
      • 2.Sc3#
    • 1...Sf3
      • 2.Rg4#
    • 1...Se3
      • 2.Sd2#
    • 1...Sxg3
      • 2.Rg4#
    • 1...Sh4
      • 2.Rg4#
    • 1...Sd6
      • 2.Rg4#
    • 1...Sg7
      • 2.Rg4#
    • 1...b5
      • 2.Sc5#
  • Tries
    • 1.Bf3+?
      • 1...Sxf3
        • 2.Rg4#
      • 1...Kxf3!
    • 1.Qxb6?
      • threat
        • 2.Sc5#
      • 1...Rxa6
        • 2.Sc3#
      • 1...Ra5
        • 2.Sc3#
      • 1...Sc2
        • 2.Sd2#
      • 1...Se2
        • 2.Sd2#
      • 1...Sb3
        • 2.Sc3#
      • 1...Sf3
        • 2.Rg4#
      • 1...Sb5
        • 2.Sd2#
      • 1...Sc6
        • 2.Sd2#
      • 1...Se6
        • 2.Sd2#
      • 1...d2!
  • Keys
    • 1.Rg4+!
      • 1...Kf3
        • 2.Rf4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 13
  • Sets
    • R(a);N_GUARD::S(A)
    • R(a);N_GUARD::S(A),XR(a)
    • R(a);N_GUARD,XS(H)::S(A)
    • S(c);SBLOCK::R(F)
    • S(f);SBLOCK::S(A)
    • S(f);XP(C)::R(F)
    • S(f);::R(F)
    • P(g);N_GUARD::S(H)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • S(c);SBLOCK,XB(G)::R(F)
      • Refutation
        • K(d);P_SPINS(f),S_FLIGHT,XB(G)
    • Try
      • Q(I);XP(g)
      • Threat
        • S(H)
      • Vars
        • R(a);N_GUARD,XS(H)::S(A)
        • R(a);N_GUARD::S(A)
        • S(c);::S(A)
        • S(c);S_CUTR(a)::S(A)
        • S(c);SBLOCK::R(F)
      • Refutation
        • P(b);P_PINP(C)
  • Actual
    • R(F);CHECK
    • Vars
      • K(d);P_SPINS(f),S_FLIGHT::B(G)+R(F),DCHECK
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