MESON Chess Problem Database

Problem Display
PID: 214923 (7R/6B1/5Q2/8/1pK5/p2P4/k2P4/1rR5 w - - 0 1)

Gunsberg, Isidor Arthur

Baltimore American and Commercial Advertiser, 1880

7R/6B1/5Q2/8/1pK5/p2P4/k2P4/1rR5

#2

7 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rxa1#
      • 2.Qxa1#
    • 1...Rb3
      • 2.Ra1#
      • 2.Qa1#
  • Tries
    • 1.Qb2+?
      • 1...axb2
        • 2.Ra8#
      • 1...Rxb2!
  • Keys
    • 1.Qa1+!
      • 1...Rxa1
        • 2.Rxa1#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • P(c);S_CUTR(a),XQ(E)::R(G)
      • Refutation
        • R(a);XQ(E)
  • Actual
    • Q(E);CHECK
    • Vars
      • R(a);OGATE,XQ(E)::R1(A),XR(a)
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