MESON Chess Problem Database

Problem Display
PID: 223382 (Q7/3N4/2pp2P1/3kp1B1/4R3/2K5/6P1/8 w - - 0 1)

Flagg, John O

The Nashville Union, 1885

Q7/3N4/2pp2P1/3kp1B1/4R3/2K5/6P1/8

#2

7 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Sc5?
      • 1...Kxc5
        • 2.Qa5#
      • 1...dxc5!
    • 1.Sb6+?
      • 1...Kc5
        • 2.Qa5#
      • 1...Ke6
        • 2.Qc8#
      • 1...Kxe4!
    • 1.Sf6+?
      • 1...Kc5
        • 2.Qa5#
      • 1...Ke6!
    • 1.Sf8?
      • 1...Kc5
        • 2.Qa5#
      • 1...Kxe4!
    • 1.Qxc6+?
      • 1...Ke6
        • 2.Rxe5#
      • 1...Kxc6!
    • 1.Qe8?
      • 1...c5
        • 2.Sf6#
      • 1...Kxe4!
    • 1.Qf8?
      • 1...Kxe4
        • 2.Qf3#
      • 1...Ke6
        • 2.Qf7#
      • 1...c5!
  • Keys
    • 1.Qc8!
      • 1...Kxe4
        • 2.Sf6#
      • 1...Ke6
        • 2.Sb6#
      • 1...c5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(F);
      • Vars
        • K(a);N_SPINP(c),OGATEB,P-FLIGHT,XS(F)::QAR2(G)
      • Refutation
        • P(d);XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR2(G)
        • K(a);N_SPINP(c),P_SPINP(b),S_FLIGHT::QAB(G)
      • Refutation
        • K(a);S_FLIGHT,XR(C)
    • Try
      • S(F);CHECK
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR2(G)
      • Refutation
        • K(a);N_SPINP(c),P_SPINP(b),S_FLIGHT
    • Try
      • S(F);
      • Vars
        • K(a);N_SPINP(c),P-FLIGHT::QAR2(G)
      • Refutation
        • K(a);S_FLIGHT,XR(C)
    • Try
      • Q(G);CHECK,XP(c)
      • Vars
        • K(a);P_SPINP(b),S_FLIGHT::R1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(G)
    • Try
      • Q(G);N_PINP(c)
      • Vars
        • P(c);SBLOCK::S(F)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT,XR(C)
    • Try
      • Q(G);N_PINP(c)
      • Vars
        • K(a);OGATEB,S_FLIGHT,XR(C)::QAB1(G)
        • K(a);P_SPINP(b),S_FLIGHT::QAB1(G)
      • Refutation
        • P(c);
  • Actual
    • Q(G);N_PINP(c)
    • Vars
      • K(a);S_FLIGHT,XR(C)::S(F)
      • K(a);P_SPINP(b),S_FLIGHT::QAB(G)+S(F)
      • P(c);::S(F)
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