MESON Chess Problem Database

Problem Display
PID: 81203 (8/8/2p5/2K5/p2R4/k7/1nQ5/8 w - - 0 1)

Akerblom, Johan Axel

Avesta-Posten, 1929

8/8/2p5/2K5/p2R4/k7/1nQ5/8

#2

3 + 4

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ka2
      • 2.Rxa4#
    • 1...Sd1
      • 2.Rxa4#
    • 1...Sd3+
      • 2.Rxd3#
    • 1...Sc4
      • 2.Rd3#
  • Tries
    • 1.Kxc6?
      • 1...Ka2
        • 2.Rxa4#
      • 1...Sd1
        • 2.Rxa4#
      • 1...Sd3
        • 2.Rxa4#
      • 1...Sc4!
    • 1.Rb4?
      • threat
        • 2.Qxb2#
      • 1...Ka2
        • 2.Rxa4#
        • 2.Qxb2#
      • 1...Sd1
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Sc4
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Sd3+!
    • 1.Qb1?
      • 1...Sd3+
        • 2.Rxd3#
      • 1...Kb3
        • 2.Rd3#
      • 1...Sc4
        • 2.Rd3#
      • 1...Sd1!
  • Keys
    • 1.Rd2!
      • threat
        • 2.Qxb2#
      • 1...Sd3+
        • 2.Rxd3#
        • 2.Qxd3#
      • 1...Ka2
        • 2.Qxb2#
      • 1...Sd1
        • 2.Qa2#
      • 1...Sc4
        • 2.Rd3#
        • 2.Qd3#
        • 2.Qa2#
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • K(b);P-FLIGHT,P_SPINS(a)::R(B),XP(c)
    • S(a);N_GUARD::R1(B),XP(c)
    • S(a);CHECK,N_GUARD::R(B),XS(a)
    • S(a);N_GUARD::R(B)
  • Tries
    • Try
      • K(C);P-FLIGHT,XP(d)
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a)::R(B),XP(c)
        • S(a);N_GUARD::R1(B),XP(c)
      • Refutation
        • S(a);
    • Try
      • R(B);
      • Threat
        • QAB1(A),XS(a)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(A);
      • Vars
        • S(a);CHECK,N_GUARD::R(B),XS(a)
        • K(b);P-FLIGHT,P_SPINS(a)::R(B)
        • S(a);N_GUARD::R(B)
      • Refutation
        • S(a);
  • Actual
    • R(B);
    • Threat
      • QAB1(A),XS(a)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(a)::QAR1(A),XS(a)
      • S(a);OGATE::QAR1(A)
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