MESON Chess Problem Database

Problem Display
PID: 150807 (8/8/p6p/7R/knQ5/8/1K6/n7 w - - 0 1)

Akerblom, Johan Axel

Schackvarlden, 1930

8/8/p6p/7R/knQ5/8/1K6/n7

#2

3 + 5

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...a5
      • 2.Qb5#
  • Tries
    • 1.Kxa1?
      • 1...Ka3
        • 2.Ra5#
      • 1...a5!
    • 1.Kc3?
      • threat
        • 2.Qxb4#
      • 1...Ka3
        • 2.Ra5#
      • 1...Sc2
        • 2.Qb3#
      • 1...a5!
    • 1.Rc5?
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...a5
        • 2.Qb5#
      • 1...h5!
    • 1.Rd5?
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...a5
        • 2.Qb5#
      • 1...h5!
    • 1.Re5?
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...a5
        • 2.Qb5#
      • 1...h5!
    • 1.Rf5?
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...a5
        • 2.Qb5#
      • 1...h5!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Qxa6#
        • 2.Qxb4#
      • 1...Ka5
        • 2.Qxb4#
      • 1...Sc2
        • 2.Qxa6#
      • 1...Sb3
        • 2.Qxb4#
      • 1...a5
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
    • P(d);N_GUARD::QAB1(B)
  • Tries
    • Try
      • K(A);S_FLIGHT,XS(a)
      • Vars
        • K(b);N_SPINS(c),P-FLIGHT::R(C)
      • Refutation
        • P(d);
    • Try
      • K(A);S_FLIGHT
      • Threat
        • QAR1(B),XS(c)
      • Vars
        • K(b);N_SPINS(c),P-FLIGHT::R(C)
        • S(a);N_GUARD::QAB1(B)
      • Refutation
        • P(d);
    • Try
      • R(C);
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(d);N_GUARD::QAB1(B)
      • Refutation
        • P(e);
    • Try
      • R(C);
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(d);N_GUARD::QAB1(B)
      • Refutation
        • P(e);
    • Try
      • R(C);
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(d);N_GUARD::QAB1(B)
      • Refutation
        • P(e);
    • Try
      • R(C);
      • Vars
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(d);N_GUARD::QAB1(B)
      • Refutation
        • P(e);
  • Actual
    • R(C);
    • Threat
      • DUALS(2)
    • Vars
      • K(b);N_SPINS(c),P-FLIGHT::QAB1(B),XS(c)
      • S(a);::QAR2(B),XP(d)
      • S(a);::QAR1(B),XS(c)
      • P(d);SBLOCK::QAB(B)
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