MESON Chess Problem Database

Problem Display
PID: 148059 (4N3/3p4/1K6/3k4/8/5Rn1/4RnQ1/B7 w - - 0 1)

Meyer, Heinrich Friedrich Ludwig

Deutsches Wochenschach, 1892

4N3/3p4/1K6/3k4/8/5Rn1/4RnQ1/B7

#2

6 + 4

5454 Near Snap 2013
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qg8#
    • 1...Sh1
      • 2.Qg8#
    • 1...Se4
      • 2.Qg8#
    • 1...Sf5
      • 2.Qg8#
    • 1...Sh5
      • 2.Qg8#
  • Tries
    • 1.Sf6+?
      • 1...Kd6
        • 2.Qxg3#
      • 1...Kc4!
    • 1.Sc7+?
      • 1...Kd6
        • 2.Rf6#
        • 2.Qxg3#
      • 1...Kc4!
    • 1.Rfxf2+?
      • 1...Se4
        • 2.Qxe4#
        • 2.Qg8#
      • 1...Kc4!
    • 1.Rxg3+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Kc4!
    • 1.Rf4+?
      • 1...Sge4
        • 2.Qg8#
      • 1...Sfe4!
  • Keys
    • 1.Re4!
      • 1...Kxe4
        • 2.Sf6#
      • 1...Sfxe4
        • 2.Qa2#
      • 1...Sgxe4
        • 2.Qg8#
      • 1...Sd1
        • 2.Rd3#
      • 1...Sfh1
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
      • 1...Sh3
        • 2.Rd3#
      • 1...Sg4
        • 2.Rd3#
      • 1...Sf1
        • 2.Rf5#
      • 1...Sgh1
        • 2.Rf5#
      • 1...Se2
        • 2.Rf5#
      • 1...Sf5
        • 2.Rxf5#
      • 1...Sh5
        • 2.Rf5#
      • 1...d6
        • 2.Sf6#

This anticipates 148061(1906), 148062(1909), 148063(1921)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE::QAB(C)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB(C),XS(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(F);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(D);CHECK,XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(D);CHECK,XS(b)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(C),XS(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(D);CHECK
      • Vars
        • S(b);OGATE,P_SPINS(b)::QAB(C)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • R(B);
    • Vars
      • K(c);S_FLIGHT,XR(B)::S(F)
      • S(a);OGATE,SBLOCK,XR(B)::QAB(C)
      • S(b);OGATE,SBLOCK,XR(B)::QAB(C)
      • S(a);N_GUARD::R(D)
      • S(a);N_GUARD::R(D),XS(a)
      • S(b);N_GUARD::R(D)
      • S(b);N_GUARD::R(D),XS(b)
      • P(d);SBLOCK::S(F)
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