MESON Chess Problem Database

Problem Display
PID: 148061 (8/8/5K2/2B5/4k3/7N/1nR5/1QnR4 w - - 0 1)

Forster, Fritz

Schweizerische Schachzeitung, 1906

8/8/5K2/2B5/4k3/7N/1nR5/1QnR4

#2

6 + 3

14868 Pirnie Collection 2013
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Qb7#
    • 1...Sa4
      • 2.Qb7#
    • 1...Sc4
      • 2.Qb7#
  • Tries
    • 1.Rdd2?
      • 1...Scd3
        • 2.Qh1#
      • 1...Sbd3
        • 2.Qb7#
      • 1...Sa2
        • 2.Qh1#
      • 1...Se2
        • 2.Qh1#
      • 1...Sb3
        • 2.Qh1#
      • 1...Sd1
        • 2.Qb7#
      • 1...Sa4
        • 2.Qb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Kf3!
    • 1.Rd6?
      • 1...Sa2
        • 2.Qh1#
      • 1...Se2
        • 2.Qh1#
      • 1...Sb3
        • 2.Qh1#
      • 1...Scd3
        • 2.Qh1#
      • 1...Sd1
        • 2.Qb7#
      • 1...Sbd3
        • 2.Qb7#
      • 1...Sa4
        • 2.Qb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Kf3!
    • 1.Rd7?
      • 1...Sa2
        • 2.Qh1#
      • 1...Se2
        • 2.Qh1#
      • 1...Sb3
        • 2.Qh1#
      • 1...Scd3
        • 2.Qh1#
      • 1...Sd1
        • 2.Qb7#
      • 1...Sbd3
        • 2.Qb7#
      • 1...Sa4
        • 2.Qb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Kf3!
    • 1.Rd8?
      • 1...Sa2
        • 2.Qh1#
      • 1...Se2
        • 2.Qh1#
      • 1...Sb3
        • 2.Qh1#
      • 1...Scd3
        • 2.Qh1#
      • 1...Sd1
        • 2.Qb7#
      • 1...Sbd3
        • 2.Qb7#
      • 1...Sa4
        • 2.Qb7#
      • 1...Sc4
        • 2.Qb7#
      • 1...Kf3!
    • 1.Rcxc1+?
      • 1...Sd3
        • 2.Qxd3#
        • 2.Qb7#
      • 1...Kf3!
    • 1.Rxb2+?
      • 1...Sd3
        • 2.Qxd3#
      • 1...Kf3!
    • 1.Rf2+?
      • 1...Sbd3
        • 2.Qb7#
      • 1...Scd3!
    • 1.Rc3+?
      • 1...Sbd3
        • 2.Qb7#
      • 1...Scd3!
  • Keys
    • 1.Rd3!
      • 1...Kxd3
        • 2.Sf2#
      • 1...Scxd3
        • 2.Qh1#
      • 1...Sbxd3
        • 2.Qb7#
      • 1...Sa2
        • 2.Re2#
      • 1...Se2
        • 2.Rxe2#
      • 1...Sb3
        • 2.Re2#
      • 1...Sd1
        • 2.Rc4#
      • 1...Sa4
        • 2.Rc4#
      • 1...Sc4
        • 2.Rxc4#

Anticipated by 148059(1892)

This anticipates 148062(1909)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE::QAB(A)
  • Tries
    • Try
      • R(B);
      • Vars
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);
      • Vars
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);
      • Vars
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(B);
      • Vars
        • S(a);OGATE::QAB(A)
        • S(b);OGATE::QAB(A)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(C);CHECK,XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(C);CHECK,XS(b)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(C);CHECK
      • Vars
        • S(b);OGATE,P_SPINS(b)::QAB(A)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • R(C);CHECK
      • Vars
        • S(b);OGATE,P_SPINS(b)::QAB(A)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • R(B);
    • Vars
      • K(c);S_FLIGHT,XR(B)::S(D)
      • S(a);OGATE,SBLOCK,XR(B)::QAB(A)
      • S(b);OGATE,SBLOCK,XR(B)::QAB(A)
      • S(a);N_GUARD::R(C)
      • S(a);N_GUARD::R(C),XS(a)
      • S(b);N_GUARD::R(C)
      • S(b);N_GUARD::R(C),XS(b)
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