MESON Chess Problem Database

Problem Display
PID: 221355 (4RB2/3p3b/1p6/1P1kpN2/n1R1p1B1/1P2p1rr/5P2/1K1N2nq w - - 0 1)

Eerkes, Allard Pieter

Suomen Shakki, 1936

4RB2/3p3b/1p6/1P1kpN2/n1R1p1B1/1P2p1rr/5P2/1K1N2nq

#2

10 + 12

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf3
      • 2.Sxe3#
    • 1...Sb2
      • 2.Sc3#
    • 1...Sc3+
      • 2.Sxc3#
    • 1...Sc5
      • 2.Sc3#
    • 1...d6
      • 2.Se7#
  • Tries
    • 1.Rc5+?
      • 1...Sxc5
        • 2.Sc3#
      • 1...bxc5!
  • Keys
    • 1.f4!
      • threat
        • 2.Rxe5#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...exf4
        • 2.Rd4#
      • 1...exf4 ep
        • 2.Sxe3#
      • 1...Sf3
        • 2.Sxe3#
      • 1...d6
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(a);P_PINS(B),S_CUTR(d)::S(H),XP(c)
    • S(f);N_GUARD::S(B)
    • S(f);CHECK,N_GUARD::S(B),XS(f)
    • P(k);SBLOCK::S(H)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • S(f);XR(E)::S(B)
      • Refutation
        • P(j);XR(E)
  • Actual
    • P(C);
    • Threat
      • R1(I),XP(i)
    • Vars
      • S(f);CHECK,N_GUARD::S(B),XS(f)
      • P(i);N_GUARD,XP(C)::R1(E)
      • P(g);EP,P_PINS(H),S_CUTR(d),XP(C)::S(B),XP(c)
      • S(a);P_PINS(B),S_CUTR(d)::S(H),XP(c)
      • P(k);SBLOCK::S(H)
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