MESON Chess Problem Database

Problem Display
PID: 187975 (8/4N3/2P2p2/4k3/7K/1R4P1/Q1R5/1B6 w - - 0 1)

Onitiu, Valerian

Deutsches Wochenschach, 1910

8/4N3/2P2p2/4k3/7K/1R4P1/Q1R5/1B6

#2

8 + 2

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Rd2?
      • threat
        • 2.Re3#
        • 2.Rb5#
      • 1...Ke6
        • 2.Re3#
      • 1...f5!
    • 1.Rd3?
      • threat
        • 2.Re2#
        • 2.Qd5#
      • 1...Ke4
        • 2.Re2#
        • 2.Qd5#
      • 1...f5!
    • 1.Re3+?
      • 1...Kd4
        • 2.Sf5#
        • 2.Qa7#
      • 1...Kd6!
  • Keys
    • 1.Sf5!
      • 1...Ke4
        • 2.Rc5#
      • 1...Kd5
        • 2.Re3#
      • 1...Kxf5
        • 2.Re2#
      • 1...Ke6
        • 2.Rb5#

This anticipates 77081(1948), 23456(1963), 93816(1968), 243965(1986), 7367(1999)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAB(B)+R(D),DCHECK
      • Refutation
        • P(b);
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • R(D);CHECK
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(H);
    • Vars
      • K(a);P-FLIGHT::B(A)+R(C)
      • K(a);P-FLIGHT::QAB(B)+R(D)
      • K(a);P-FLIGHT,XS(H)::B(A)+R(C)
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