MESON Chess Problem Database

Problem Display
PID: 89950 (8/1QP5/rp6/k7/8/1K6/8/8 w - - 0 1)

Markovtsy, Vassyl Yuriovich

Die Schwalbe, 1999

8/1QP5/rp6/k7/8/1K6/8/8

#2

3 + 3

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Kb5
      • 2.Qd5#
  • Tries
    • 1.Qe4?
      • threat
        • 2.Qa4#
        • 2.Qb4#
      • 1...Kb5
        • 2.Qd5#
      • 1...Ra7
        • 2.Qa4#
      • 1...Ra8
        • 2.Qa4#
      • 1...b5!
    • 1.c8S?
      • 1...Kb5
        • 2.Qd5#
      • 1...Ra7
        • 2.Qxb6#
      • 1...Ra8
        • 2.Qxb6#
      • 1...b5!
  • Keys
    • 1.Kc4!
      • 1...b5+
        • 2.Qxb5#
      • 1...Ka4
        • 2.Qxa6#
      • 1...Ra7
        • 2.Qxa7#
      • 1...Ra8
        • 2.Qxa8#

Anticipated by 38143(1940), 264919(1993)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT,P_SPINP(c)::QAR2(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • R(b);::QAR1(B)
      • Refutation
        • P(c);
    • Try
      • P(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::QAR2(B)
        • R(b);N_GUARD::QAB1(B),XP(c)
      • Refutation
        • P(c);
  • Actual
    • K(A);S_FLIGHT
    • Vars
      • P(c);CHECK,OGATE::QAR1(B),XP(c)
      • K(a);P-FLIGHT::QAR2(B),XR(b)
      • R(b);OGATEB::QAR2(B),XR(b)
      • R(b);OGATEB::QAR(B),XR(b)
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