MESON Chess Problem Database

Problem Display
PID: 99370 (3n4/k2K4/8/8/8/8/7R/rR2Q3 w - - 0 1)

Rozsa, Andor

Magyar Sakkelet, 1985

3n4/k2K4/8/8/8/8/7R/rR2Q3

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Rxa2#
    • 1...Ra5
      • 2.Qxa5#
  • Tries
    • 1.Rxa1+?
      • 1...Kb6
        • 2.Qb4#
      • 1...Kb7
        • 2.Rb2#
        • 2.Qb4#
        • 2.Qb1#
      • 1...Kb8!
    • 1.Qf2+?
      • 1...Ka6
        • 2.Qb6#
      • 1...Ka8!
    • 1.Qg1+?
      • 1...Ka6
        • 2.Qb6#
      • 1...Ka8!
    • 1.Qe3+?
      • 1...Ka6
        • 2.Qb6#
      • 1...Ka8!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Rxa1#
      • 1...Ka6
        • 2.Rxa1#
        • 2.Qb6#
      • 1...Ka8
        • 2.Rxa1#
        • 2.Qb8#
      • 1...Rxb1
        • 2.Ra2#
      • 1...Sb7
        • 2.Qxb7#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qb8#
      • 1...Sc6
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::R(C),XR(a)
    • R(a);N_GUARD::QAR2(B),XR(a)
  • Tries
    • Try
      • R(A);CHECK,XR(a)
      • Vars
        • K(b);S_FLIGHT::QAR2(B)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • R(A),XR(a)
    • Vars
      • R(a);N_GUARD,XR(A)::R(C)
      • S(c);N_GUARD::QAR1(B),XS(c)
      • R(a);N_GUARD::QAR(B),XR(a)
      • R(a);N_GUARD::R(C),XR(a)
      • R(a);N_GUARD::QAR2(B),XR(a)
      • R(a);SBLOCK::QAB1(B)
      • S(c);N_GUARD::QAR1(B)
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