MESON Chess Problem Database

Problem Display
PID: 183106 (8/2b5/8/8/k1K1Q3/8/8/8 w - - 0 1)

Blumenthal, Oscar

Schweizerische Schachzeitung, 1907

8/2b5/8/8/k1K1Q3/8/8/8

#2

2 + 2

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bh2
      • 2.Qa8#
    • 1...Bg3
      • 2.Qa8#
    • 1...Bf4
      • 2.Qa8#
    • 1...Be5
      • 2.Qa8#
    • 1...Bd6
      • 2.Qa8#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qa2#
        • 2.Qa1#
        • 2.Qb4#
      • 1...Ka3
        • 2.Qa1#
        • 2.Qb3#
      • 1...Ka5
        • 2.Qb5#
      • 1...Ba5
        • 2.Qa2#
        • 2.Qa1#
        • 2.Qb3#
      • 1...Be5
        • 2.Qa2#
        • 2.Qb4#
      • 1...Bd6!
    • 1.Qh1?
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Be5
        • 2.Qa8#
      • 1...Bd6
        • 2.Qa8#
      • 1...Ka5!
    • 1.Qc2+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5!
    • 1.Qc6+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Ka3!
    • 1.Qb7?
      • threat
        • 2.Qb4#
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5
        • 2.Qb5#
        • 2.Qa7#
      • 1...Ba5
        • 2.Qb3#
      • 1...Bd6
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qa7#
      • 1...Bb6!
    • 1.Qe1?
      • threat
        • 2.Qb4#
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ba5
        • 2.Qa1#
      • 1...Be5
        • 2.Qb4#
      • 1...Bd6!
    • 1.Qe8+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Ka3!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qa1#
      • 1...Ka3
        • 2.Qa1#
      • 1...Ka5
        • 2.Qa7#
      • 1...Be5
        • 2.Qa7#
      • 1...Bd6
        • 2.Qa7#

Anticipated by 47227(1849), 110515(1870)

This anticipates 193729(1916), 166257(1917), 149134(1929), 172254(1996), 173962(2005), 169981(2017)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(b);N_GUARD,SBLOCK::QAR(B)
    • B(b);N_GUARD::QAR(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • B(b);N_GUARD::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • B(b);SBLOCK::QAB1(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • B(b);SBLOCK::QAR(B)
        • B(b);::QAR1(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • B(b);N_GUARD::QAR(B)
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