MESON Chess Problem Database

Problem Display
PID: 1979 (5R2/1N3p2/3pk3/6PR/3Q4/B3K3/8/8 w - - 0 1)

Loyd, Sam

La Strategie, 1867

5R2/1N3p2/3pk3/6PR/3Q4/B3K3/8/8

#2

7 + 3

1679 American Chess Nuts 1868
5689 The Chess Monthly (Hoffer) 1882
16 Chess Amateur (The) 1906
2794 Terms & Themes of Chess Problems 1907
15 British Chess Magazine 1911
5206 Sam Loyd and His Chess Problems 1913
887 Mate in Two Moves 1931
81 Chess 1949
81 Chess 1956
3310 2345 Chess Problems 1997
5637 Prague Series Solving Ty. 2002-2003
5405 Chess Solving Yearbook 2003 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qe4#
    • 1...Kd7
      • 2.Qxd6#
    • 1...Ke7
      • 2.Qxd6#
    • 1...f5
      • 2.Qxd6#
  • Tries
    • 1.Ke4?
      • threat
        • 2.Qxd6#
      • 1...d5+
        • 2.Qxd5#
      • 1...Kd7
        • 2.Qxd6#
      • 1...Ke7
        • 2.Qxd6#
      • 1...f5+!
    • 1.Kf4?
      • threat
        • 2.Qxd6#
      • 1...Kd7
        • 2.Qxd6#
      • 1...Ke7
        • 2.Qxd6#
      • 1...d5!
    • 1.Sd8+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Ke7
        • 2.Qxd6#
      • 1...Kd7!
    • 1.Rh6+?
      • 1...Kf5
        • 2.Qf4#
      • 1...Kd7
        • 2.Qxd6#
      • 1...Ke7
        • 2.Qxd6#
      • 1...f6!
    • 1.Re8+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd7!
    • 1.Qf6+?
      • 1...Kd7
        • 2.Qxd6#
      • 1...Kd5!
    • 1.Qd5+?
      • 1...Kd7
        • 2.Qxd6#
      • 1...Ke7
        • 2.Qxf7#
        • 2.Qxd6#
      • 1...Kxd5!
    • 1.g6?
      • threat
        • 2.Qxd6#
      • 1...Kd7
        • 2.Qxd6#
      • 1...Ke7
        • 2.Qxd6#
      • 1...d5!
  • Keys
    • 1.Qg4+!
      • 1...Kd5
        • 2.Qe4#
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke7
        • 2.Bxd6#
      • 1...f5
        • 2.gxf5 ep#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • K(b);P_SPINP(c),S_FLIGHT::QAB1(C)
    • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
    • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
    • P(c);::QAR1(C),XP(a)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • QAR1(C),XP(a)
      • Vars
        • P(a);CHECK::QAB1(C),XP(a)
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
        • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
      • Refutation
        • P(c);CHECK
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR1(C),XP(a)
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
        • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
      • Refutation
        • P(a);
    • Try
      • S(F);CHECK
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::QAB1(C)
        • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(b);P_SPINP(c),S_FLIGHT::QAR1(C)
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
        • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • R(G);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C),XP(a)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
    • Try
      • P(D);
      • Threat
        • QAR1(C),XP(a)
      • Vars
        • K(b);P_SPINP(a),S_FLIGHT::QAR1(C),XP(a)
        • K(b);P-FLIGHT,P_SPINP(a)::QAB1(C),XP(a)
      • Refutation
        • P(a);
  • Actual
    • Q(C);CHECK
    • Vars
      • K(b);S_FLIGHT::QAB1(C)
      • K(b);P-FLIGHT::QAR1(C)
      • K(b);P-FLIGHT,P_SPINP(a)::B(A),XP(a)
      • P(c);OGATE,P_SPINP(c)::QAB(C)+P(D),XP(c),EP
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