MESON Chess Problem Database

Problem Display
PID: 2513 (8/r1b5/1R1N4/kq6/p2Q4/8/K7/8 w - - 0 1)

Loyd, Sam

New York Musical World, 1859

8/r1b5/1R1N4/kq6/p2Q4/8/K7/8

#2

4 + 5

153 La Strategie 1867
1679 American Chess Nuts 1868
5206 Sam Loyd and His Chess Problems 1913
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Qb4#
    • 1...Qd3
      • 2.Qb4#
    • 1...Qc4+
      • 2.Sxc4#
    • 1...Qa6
      • 2.Qb4#
    • 1...Qc6
      • 2.Qb4#
    • 1...Qd7
      • 2.Sc4#
      • 2.Qb4#
    • 1...Qe8
      • 2.Sc4#
      • 2.Qb4#
    • 1...Qb4
      • 2.Qxb4#
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qe5
      • 2.Sc4#
      • 2.Qb4#
    • 1...Qf5
      • 2.Sc4#
      • 2.Qb4#
    • 1...Qg5
      • 2.Sc4#
      • 2.Qb4#
    • 1...Qh5
      • 2.Sc4#
      • 2.Qb4#
    • 1...Ra6
      • 2.Sb7#
      • 2.Rxb5#
    • 1...Rb7
      • 2.Sxb7#
    • 1...Ra8
      • 2.Sb7#
  • Tries
    • 1.Qc3+?
      • 1...Qb4
        • 2.Sc4#
        • 2.Qxb4#
      • 1...Kxb6!
    • 1.Qc5?
      • threat
        • 2.Sc4#
        • 2.Qxb5#
      • 1...Bxb6
        • 2.Qxb5#
      • 1...Bxd6
        • 2.Qxb5#
      • 1...a3
        • 2.Qxb5#
      • 1...Qxc5!
    • 1.Qd2+?
      • 1...Qb4
        • 2.Sc4#
        • 2.Qxb4#
      • 1...Kxb6!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qxb5#
      • 1...Qd5+
        • 2.Sc4#
      • 1...Kb4
        • 2.Rxb5#
      • 1...Kxb6
        • 2.Qxb5#
      • 1...Qxe5
        • 2.Sc4#
      • 1...Qc5
        • 2.Sc4#
        • 2.Qxc5#

This anticipates 172422(1997)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(c);N_GUARD::QAB1(B)
    • Q(c);CHECK,N_GUARD::S(D),XQ(c)
    • Q(c);N_GUARD::QAB1(B),XQ(c)
    • Q(c);OGATEB::QAR2(B),XQ(c)
    • R(d);N_GUARD::S(D),XR(d)
    • R(d);N_GUARD::S(D)
  • Tries
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(C)
    • Try
      • Q(B);P_PINQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(e);XR(C)::QAR1(B),XQ(c)
        • B(e);XS(D)::QAR1(B),XQ(c)
        • P(a);::QAR1(B),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT,XR(C)
  • Actual
    • Q(B);P_PINQ(c)
    • Threat
      • QAR1(B),XQ(c)
    • Vars
      • Q(c);CHECK::S(D)
      • K(b);S_FLIGHT::R1(C),XQ(c)
      • K(b);N_SPINQ(c),S_FLIGHT,XR(C)::QAR1(B),XQ(c)
      • Q(c);N_SPINQ(c),XQ(B)::S(D)
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