MESON Chess Problem Database

Problem Display
PID: 197036 (K4NB1/4P2R/p1rkr3/2p4b/7n/4N2p/1QP3pq/BR6 w - - 0 1)

Dyummel, Fridrik

Rukhlis, Efim Naumovich

Praca, 1965

K4NB1/4P2R/p1rkr3/2p4b/7n/4N2p/1QP3pq/BR6

#2

10 + 10

133 The Problemist Supplement 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kc7
      • 2.Qb8#
    • 1...Rb6
      • 2.Qxb6#
    • 1...Rg6
      • 2.e8S#
  • Tries
    • 1.Sc4+?
      • 1...Kc7
        • 2.Qb7#
        • 2.Qb8#
      • 1...Kd5!
    • 1.Rd1+?
      • 1...Kc7
        • 2.Qb7#
        • 2.Qb8#
      • 1...Bxd1!
    • 1.Qd4+?
      • 1...Kc7
        • 2.Qd7#
        • 2.Qd8#
      • 1...cxd4!
    • 1.e8S+?
      • 1...Bxe8
        • 2.Rd1#
      • 1...Rxe8+!
  • Keys
    • 1.Qb8+!
      • 1...Rc7
        • 2.Rb6#

This is a version

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(i);S_FLIGHT::QAB1(C)
    • R(h);OGATEB::QAR2(C),XR(h)
    • R(j);N_GUARD,S_CUTB(f)::P=S
  • Tries
    • Try
      • S(E);CHECK
      • Refutation
        • K(i);P-FLIGHT,P_SPINR(j)
    • Try
      • R(B);CHECK
      • Refutation
        • B(f);XR(B)
    • Try
      • Q(C);CHECK
      • Refutation
        • P(e);XQ(C)
    • Try
      • P(F);CHECK
      • Vars
        • B(f);XS(F)::R(B)
      • Refutation
        • R(j);CHECK,XS(F)
  • Actual
    • Q(C);CHECK
    • Vars
      • R(h);P_SPINR(h)::R(B)
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