MESON Chess Problem Database

Problem Display
PID: 22076 (5K2/8/8/8/5k2/3P1N1P/5Q2/5R2 w - - 0 1)

Onitiu, Valerian

Chess Amateur (The), 1924

5K2/8/8/8/5k2/3P1N1P/5Q2/5R2

#2

6 + 1

3295 Einfuhrung in die Welt des Schachproblem 1984
136 Problem Observer 2009
5454 Near Snap 2011

SOLUTION

  • SOUND
  • Tries
    • 1.Sg5+?
      • 1...Ke5
        • 2.Qc5#
      • 1...Kxg5!
    • 1.Qd4+?
      • 1...Kg3
        • 2.Qg4#
      • 1...Kf5!
    • 1.Qh4+?
      • 1...Ke3
        • 2.Qe4#
      • 1...Kf5!
    • 1.Qa7?
      • 1...Kf5
        • 2.Qf7#
      • 1...Kg3!
    • 1.Qb2?
      • threat
        • 2.Qe5#
      • 1...Ke3
        • 2.Qd2#
      • 1...Kg3
        • 2.Qh2#
      • 1...Kf5!
    • 1.Qc2?
      • 1...Ke3
        • 2.Qd2#
      • 1...Kg3
        • 2.Qh2#
      • 1...Kf5!
    • 1.Qd2+?
      • 1...Kg3
        • 2.Qh2#
      • 1...Kf5!
    • 1.Qe2?
      • threat
        • 2.Qe5#
      • 1...Kg3
        • 2.Qh2#
      • 1...Kf5!
    • 1.Qg2?
      • threat
        • 2.Qg5#
      • 1...Ke3
        • 2.Qd2#
      • 1...Kf5!
    • 1.Qh2+?
      • 1...Ke3
        • 2.Qd2#
      • 1...Kf5!
  • Keys
    • 1.Qa2!
      • 1...Ke3
        • 2.Qd2#
      • 1...Kg3
        • 2.Qh2#
      • 1...Kf5
        • 2.Qf7#

Anticipated by 206947(1859), 4506(1873), 32680(1873), 214539(1878), 218488(1882), 218611(1882), 181144(1904), 182379(1906), 109336(1920)

This anticipates 206740(1925), 227725(1926), 18804(1958), 218807(1976), 138100(1981), 133136(1983), 211346(1986), 184446(2000), 47757(2003), 67253(2006), 232491(2012), 235007(2019)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT,XS(D)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAB1(B)
      • K(a);P-FLIGHT::QAR2(B)
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