MESON Chess Problem Database

Problem Display
PID: 82458 (r7/3N4/8/kpQ5/8/3N4/rp6/bK6 w - - 0 1)

Akerblom, Johan Axel

Springaren, 1953

r7/3N4/8/kpQ5/8/3N4/rp6/bK6

#2

4 + 6

6490 yacpdb 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qb4#
    • 1...Ka6
      • 2.Qb6#
    • 1...Ra3
      • 2.Qxa3#
    • 1...Ra4
      • 2.Qb6#
    • 1...Ra6
      • 2.Qb4#
    • 1...Ra7
      • 2.Qxa7#
    • 1...Rb8
      • 2.Qa7#
    • 1...Rc8
      • 2.Qa7#
    • 1...Rd8
      • 2.Qa7#
    • 1...Re8
      • 2.Qa7#
    • 1...Rf8
      • 2.Qa7#
    • 1...Rg8
      • 2.Qa7#
    • 1...Rh8
      • 2.Qa7#
  • Tries
    • 1.Qc7+?
      • 1...Ka6
        • 2.Sb4#
        • 2.S3c5#
        • 2.S7c5#
        • 2.Qb6#
      • 1...Ka4!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxa2#
        • 2.Qxa8#
      • 1...Ka4
        • 2.Qxa2#
      • 1...Ka6
        • 2.Qxa8#
      • 1...Ra4
        • 2.Qxa8#
      • 1...Ra3
        • 2.Qxa8#
      • 1...Ra6
        • 2.Qxa2#
      • 1...Ra7
        • 2.Qxa2#
      • 1...Rb8
        • 2.Qxa2#
      • 1...Rc8
        • 2.Qxa2#
      • 1...Rd8
        • 2.Qxa2#
      • 1...Re8
        • 2.Qxa2#
      • 1...Rf8
        • 2.Qxa2#
      • 1...Rg8
        • 2.Qxa2#
      • 1...Rh8
        • 2.Qxa2#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 13
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINP(e),P-FLIGHT::QAR1(C)
    • R(b);N_GUARD::QAR2(C),XR(b)
    • R(b);SBLOCK::QAB1(C)
    • R(f);SBLOCK::QAB1(C)
    • R(f);N_GUARD::QAR2(C),XR(f)
    • R(f);N_GUARD::QAR2(C)
  • Tries
    • Try
      • Q(C);CHECK,N_PINP(e)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • Q(C);
    • Threat
      • DUALS(2)
    • Vars
      • K(d);N_SPINP(e),P-FLIGHT::QAR2(C),XR(b)
      • K(d);N_SPINP(e),P-FLIGHT::QAR2(C),XR(f)
      • R(b);SBLOCK::QAR(C),XR(f)
      • R(b);::QAR(C),XR(f)
      • R(f);SBLOCK::QAR(C),XR(b)
      • R(f);::QAR(C),XR(b)
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