MESON Chess Problem Database

Problem Display
PID: 223269 (8/8/4Q2B/6R1/4Np2/2p5/2p2Kp1/3k4 w - - 0 1)

Westlake, GH

English Mechanic and World of Science, 1886

(First published on Fri Mar 12 1886)

8/8/4Q2B/6R1/4Np2/2p5/2p2Kp1/3k4

#2

5 + 5

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...g1Q+
      • 2.Rxg1#
    • 1...g1S
      • 2.Rxg1#
    • 1...g1B+
      • 2.Rxg1#
    • 1...g1R
      • 2.Rxg1#
    • 1...f3
      • 2.Rd5#
  • Tries
    • 1.Qb3?
      • 1...g1Q+
        • 2.Rxg1#
      • 1...g1B+
        • 2.Rxg1#
      • 1...g1S
        • 2.Rxg1#
      • 1...g1R
        • 2.Rxg1#
      • 1...f3
        • 2.Rd5#
      • 1...Kc1!
    • 1.Qg4+?
      • 1...f3
        • 2.Rd5#
      • 1...Kc1!
    • 1.Qa6?
      • 1...g1Q+
        • 2.Rxg1#
      • 1...g1B+
        • 2.Rxg1#
      • 1...Kc1
        • 2.Qa1#
      • 1...c1Q
        • 2.Qe2#
      • 1...c1B
        • 2.Qe2#
      • 1...c1R
        • 2.Qe2#
        • 2.Qd3#
      • 1...g1S
        • 2.Rxg1#
        • 2.Qf1#
      • 1...g1R
        • 2.Rxg1#
      • 1...f3
        • 2.Rd5#
      • 1...c1S!
  • Keys
    • 1.Qa2!
      • 1...g1Q+
        • 2.Rxg1#
      • 1...g1B+
        • 2.Rxg1#
      • 1...Kc1
        • 2.Qa1#
      • 1...c1Q
        • 2.Qe2#
      • 1...c1S
        • 2.Sxc3#
      • 1...c1B
        • 2.Sxc3#
        • 2.Qe2#
      • 1...c1R
        • 2.Rd5#
        • 2.Qe2#
      • 1...g1S
        • 2.Rxg1#
      • 1...g1R
        • 2.Rxg1#
      • 1...f3
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);CHECK,OGATE::R(C),XQ(c)
    • P(c);OGATE::R(C),XS(c)
    • P(c);CHECK,OGATE::R(C),XB(c)
    • P(c);OGATE::R(C),XR(c)
    • P(e);::R(C)
  • Tries
    • Try
      • Q(D);P_PINP(b)
      • Vars
        • P(c);CHECK,OGATE::R(C),XQ(c)
        • P(c);CHECK,OGATE::R(C),XB(c)
        • P(c);OGATE::R(C),XS(c)
        • P(c);OGATE::R(C),XR(c)
        • P(e);::R(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • P(e);P_SPINP(e)::R(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • P(c);CHECK,OGATE::R(C),XQ(c)
        • P(c);CHECK,OGATE::R(C),XB(c)
        • K(a);P-FLIGHT::QAR2(D)
        • P(b);SBLOCK::QAB1(D)
        • P(c);OGATE::R(C),XR(c)
        • P(e);::R(C)
      • Refutation
        • P(b);
  • Actual
    • Q(D);
    • Vars
      • P(c);CHECK,OGATE::R(C),XQ(c)
      • P(c);CHECK,OGATE::R(C),XB(c)
      • K(a);P-FLIGHT::QAR2(D)
      • P(b);OGATE,SBLOCK::QAB1(D)
      • P(b);SBLOCK::S(B),XP(d)
      • P(c);OGATE::R(C),XS(c)
      • P(c);OGATE::R(C),XR(c)
      • P(e);::R(C)
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