MESON Chess Problem Database

Problem Display
PID: 218438 (8/p5B1/K3p3/4N1N1/2pkP3/3p4/3R4/1Q6 w - - 0 1)

Balsley, David

Philadelphia Times, 1882

8/p5B1/K3p3/4N1N1/2pkP3/3p4/3R4/1Q6

#2

7 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qb2#
    • 1...c3
      • 2.Qg1#
  • Tries
    • 1.Kxa7?
      • 1...Kc3
        • 2.Qb2#
      • 1...Kc5
        • 2.Qb6#
      • 1...c3
        • 2.Qg1#
        • 2.Qb6#
      • 1...Ke3!
    • 1.Sxd3+?
      • 1...Ke3
        • 2.Qe1#
      • 1...e5!
    • 1.Sxc4+?
      • 1...Kxc4
        • 2.Qb5#
      • 1...Kc5
        • 2.Qb5#
      • 1...e5!
    • 1.Sxe6+?
      • 1...Kc3
        • 2.Sf3#
        • 2.Qb2#
      • 1...Ke3
        • 2.Qe1#
      • 1...Kxe4!
    • 1.Rxd3+?
      • 1...Kc5
        • 2.Sxe6#
        • 2.Bf8#
        • 2.Qb5#
      • 1...cxd3!
    • 1.Qxd3+?
      • 1...Kc5
        • 2.Bf8#
        • 2.Qxc4#
        • 2.Qa3#
        • 2.Qd6#
      • 1...cxd3!
    • 1.Qa1+?
      • 1...Kc5
        • 2.Bf8#
      • 1...c3
        • 2.Qg1#
      • 1...Ke3!
    • 1.Qb5?
      • 1...Kc3
        • 2.Qb2#
      • 1...c3
        • 2.Rxd3#
      • 1...Ke3!
    • 1.Qb6+?
      • 1...Kc3
        • 2.Qb2#
      • 1...axb6!
  • Keys
    • 1.Qb8!
      • 1...Kc3
        • 2.Qb2#
      • 1...Ke3
        • 2.Sxc4#
      • 1...Kc5
        • 2.Sxe6#
      • 1...c3
        • 2.Qxa7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
    • P(b);SBLOCK::QAB(A)
  • Tries
    • Try
      • K(F);P-FLIGHT,XP(e)
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • S(D);CHECK,XP(a)
      • Vars
        • K(c);S_FLIGHT::QAR2(A)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • S(D);CHECK,XP(b)
      • Vars
        • K(c);N_SPINP(a),P-FLIGHT,XS(D)::QAB1(A)
        • K(c);N_SPINP(a),S_FLIGHT::QAR1(A)
      • Refutation
        • P(d);
    • Try
      • S(E);CHECK,XP(d)
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAR2(A)
      • Refutation
        • K(c);P-FLIGHT,XP(C)
    • Try
      • R(B);CHECK,XP(a)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(A);CHECK,XP(a)
      • Refutation
        • P(b);P_SPINP(b),XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::B(G)
        • P(b);N_SPINP(a),P_SPINP(b),SBLOCK::QAB(A)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
        • P(b);N_GUARD::R1(B),XP(a)
      • Refutation
        • K(c);N_SPINP(a),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
      • Refutation
        • P(e);XQ(A)
  • Actual
    • Q(A);
    • Vars
      • K(c);N_SPINP(a),S_FLIGHT::QAB1(A)
      • K(c);N_SPINP(a),S_FLIGHT::S(D),XP(b)
      • K(c);N_SPINP(a),S_FLIGHT::S(E),XP(d)
      • P(b);SBLOCK::QAB(A),XP(e)
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