MESON Chess Problem Database

Problem Display
PID: 132859 (4k3/2Rr2R1/5p1K/6Q1/8/8/8/8 w - - 0 1)

Akerblom, Johan Axel

3rd HM., Tidskrift for Schack, 1929

4k3/2Rr2R1/5p1K/6Q1/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Rg8#
    • 1...Rd2
      • 2.Rg8#
    • 1...Rd3
      • 2.Rg8#
    • 1...Rd4
      • 2.Rg8#
    • 1...Rd5
      • 2.Rg8#
    • 1...Rd6
      • 2.Rg8#
    • 1...Rd8
      • 2.Rg8#
  • Tries
    • 1.Rcxd7?
      • 1...Kf8
        • 2.Rd8#
        • 2.Rg8#
      • 1...f5
        • 2.Rd8#
        • 2.Qe7#
        • 2.Qd8#
      • 1...fxg5!
    • 1.Rgxd7?
      • threat
        • 2.Qg8#
      • 1...Kf8
        • 2.Rc8#
        • 2.Rd8#
      • 1...fxg5!
    • 1.Qe3+?
      • 1...Kd8
        • 2.Rgxd7#
      • 1...Re7
        • 2.Qxe7#
      • 1...Kf8!
    • 1.Qb5?
      • threat
        • 2.Rc8#
      • 1...Kd8
        • 2.Qxd7#
        • 2.Qb8#
      • 1...Kf8!
    • 1.Qh5+?
      • 1...Kd8
        • 2.Rgxd7#
      • 1...Rf7
        • 2.Rg8#
      • 1...Kf8!
    • 1.Qg6+?
      • 1...Kd8
        • 2.Rgxd7#
      • 1...Rf7
        • 2.Rg8#
      • 1...Kf8!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qg8#
      • 1...Kd8
        • 2.Qxd7#
      • 1...Kf8
        • 2.Qg8#
      • 1...Rxd5
        • 2.Rg8#
      • 1...Rxg7
        • 2.Qa8#
      • 1...Rf7
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(b);::R(D)
    • R(b);SBLOCK::R(D)
  • Tries
    • Try
      • R(C);XR(b)
      • Refutation
        • P(a);XQ(A)
    • Try
      • R(D);XR(b)
      • Threat
        • QAR2(A)
      • Refutation
        • P(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(D),XR(b)
        • R(b);N_GUARD,P_SPINR(b)::QAR1(A),XR(b)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);P_PINR(b)
      • Threat
        • R(C)
      • Refutation
        • K(c);N_SPINR(b),P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(D),XR(b)
        • R(b);P_SPINR(b)::R(D)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::R1(D),XR(b)
        • R(b);P_SPINR(b)::R(D)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • K(c);P-FLIGHT,P_SPINR(b)::QAR1(A),XR(b)
      • K(c);P-FLIGHT::QAR1(A)
      • R(b);XQ(A)::R(D)
      • R(b);N_GUARD,XR(D)::QAR(A)
      • R(b);N_GUARD::QAR(A)
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