MESON Chess Problem Database

Problem Display
PID: 190125 (6K1/8/5pk1/3Q1Rpn/8/3P4/8/8 w - - 0 1)

Onitiu, Valerian

Magyar Sakkujsag, 1913

6K1/8/5pk1/3Q1Rpn/8/3P4/8/8

#2

4 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Tries
    • 1.Qb7?
      • threat
        • 2.Qh7#
      • 1...Kxf5
        • 2.Qe4#
      • 1...Kh6
        • 2.Qh7#
      • 1...Sg7!
    • 1.Qf7+?
      • 1...Kh6
        • 2.Qh7#
      • 1...Kxf5!
    • 1.Qd7?
      • threat
        • 2.Qh7#
      • 1...Kh6
        • 2.Qh7#
      • 1...Sg7!
  • Keys
    • 1.Qh1!
      • 1...Kxf5
        • 2.Qe4#
      • 1...Kh6
        • 2.Rxf6#
      • 1...Sg3
        • 2.Qh7#
      • 1...Sf4
        • 2.Qh7#
      • 1...Sg7
        • 2.Qh7#
      • 1...g4
        • 2.Qxh5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(d);OGATEB,S_FLIGHT,XR(C)::QAB1(B)
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • K(d);P_SPINP(c),S_FLIGHT,XR(C)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);
  • Actual
    • Q(B);
    • Vars
      • K(d);OGATEB,S_FLIGHT,XR(C)::QAB1(B)
      • K(d);P-FLIGHT,P_SPINS(b)::R(C),XP(c)
      • S(b);OGATE::QAB1(B)
      • P(a);::QAB1(B),XS(b)
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